Short Answer

Carlos Alcaraz is considered unlikely to win the 2026 Men’s US Open, with the tournament in its early stages and no winner yet determined, priced at 33.0%.

1. Market Behavior & Drivers

The contract for Carlos Alcaraz to win the 2026 Men's US Open saw its largest single-day gain on August 31. The 9.0 percentage point spike, from 25.5% to 34.5%, coincided with his straight-sets victory over Roman Safiullin in the tournament's first round. Alcaraz is the defending champion.
An earlier 8.5 point increase on August 20, which lifted the implied probability from 18.0% to 26.5%, has no clear driver in available reporting. This move occurred before the tournament began on August 30.
The market has registered zero traded contracts. The price trajectory, which shows an overall upward trend from 13.5% to a current 33.5%, reflects price adjustments without any backing from trader activity. This lack of volume indicates the price changes do not represent shifts in market sentiment or conviction.
  • Carlos Alcaraz remains favored, despite a four-month layoff from a right wrist injury.
  • Alexander Zverev's top seeding and strong 2026 Grand Slam form bolster his position.

Current Context

The 2026 US Open is underway, with no winner yet. The tournament began on August 30, 2026, and is scheduled to conclude on September 13, 2026 [1][2][3][4][5][6]. As of September 1, 2026, the Men's Singles tournament is in its early stages, and no winner has been determined [7][4][5][6][8]. US Open Fan Week began this weekend at Flushing Meadows, scheduled to run from Sunday to Saturday [9][10].
Key contenders Alcaraz and Zverev are competing, Djokovic is out. Carlos Alcaraz, the 2025 US Open champion, is actively competing as the defending champion in the 2026 tournament [3][7][11]. As of September 1, 2026, Alcaraz has advanced to the second round [7]. Top seed Alexander Zverev remains in the draw, while Novak Djokovic has been eliminated from the competition [7].
Sources (11)
  1. 1US Open tennis tournament 2026 | Schedule & resultslta.org.uk
  2. 2When Is US Open 2026 Men's Final Date? · WhenIswhenis.net
  3. 32026 US Open (tennis)en.wikipedia.org
  4. 4US Open | Overview | ATP Tour | Tennisatptour.com
  5. 5US Open 2026: Draws, Dates, History & All You Need To Knowatptour.com
  6. 6What is the US Open schedule? | ATP Tour | Tennisatptour.com
  7. 7US Open 2026 results: Carlos Alcaraz beats Roman Safiullin on singles return - how did defending champion look? - BBC Sportbbc.com
  8. 8What were the US Open results? | ATP Tour | Tennisatptour.com
  9. 9Bloomberg Money: Bond Moves, Social Security and the US Open | Bloomberg Intelligenceyoutube.com
  10. 10Bloomberg Money: Bond Moves, Social Security and the US Open | Bloomberg Surveillanceyoutube.com
  11. 11Alcaraz returns for title defence; Djokovic, Zverev loom at...atptour.com

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Significant Price Movements

Notable price changes detected in the chart, along with research into what caused each movement.

Outcome: Carlos Alcaraz

📈 August 31, 2026: 9.0pp spike

Price increased from 25.5% to 34.5%

What happened: The primary driver of the 9.0 percentage point price spike for Carlos Alcaraz on August 31, 2026, was his successful first-round match at the 2026 Men's US Open [1][2][3]. On that date, Alcaraz, the defending champion, defeated Roman Safiullin in straight sets (6-4, 6-4, 6-4) to advance to the second round [3][4]. This strong performance early in the tournament by a top contender likely increased market confidence in his potential to win, directly preceding the price movement [1][2][3][5]. Social media activity was not identified as a primary driver based on the available information.

📈 August 20, 2026: 8.5pp spike

Price increased from 18.0% to 26.5%

What happened: No primary driver for the 8.5 percentage point spike in Carlos Alcaraz's odds on August 20, 2026, can be identified from the provided web research. The available sources indicate the 2026 US Open tournament began on August 30, 2026 [6][4], with Carlos Alcaraz winning a match on August 31, 2026 [2][1]. These events occurred after the reported price movement. There is no information detailing social media activity, news announcements, or market factors specifically on or before August 20, 2026, that would explain the spike. Therefore, social media activity, traditional news, or market factors cannot be determined as a primary driver or contributing accelerant based on the provided data, as relevant information for the specified date is absent.

Outcome: Alexander Zverev

📈 August 21, 2026: 9.4pp spike

Price increased from 11.5% to 20.8%

What happened: The primary driver of Alexander Zverev's prediction market spike on August 21, 2026, was likely the traditional news that he became the No. 1 seed for the 2026 US Open following the withdrawal of world No. 1 Jannik Sinner [7][8][9]. This significant development, which elevated Zverev's championship prospects, was confirmed by August 27, 2026 [8], making it a highly probable cause for the market movement on August 21, 2026. The provided research contains no evidence of specific social media activity or viral narratives impacting the market, suggesting social media was irrelevant as a primary driver.
Sources (9)
  1. 1US Open 2026 results: Carlos Alcaraz beats Roman Safiullin on singles return - how did defending champion look? - BBC Sportbbc.com
  2. 2Defending champ Carlos Alcaraz wins comeback match at...usopen.org
  3. 3Alcaraz eases past Safiullin on return at US Openatptour.com
  4. 4What were the US Open results? | ATP Tour | Tennisatptour.com
  5. 5US Open 2026: Carlos Alcaraz impresses on return from...skysports.com
  6. 62026 US Open (tennis)en.wikipedia.org
  7. 72026 US Open – Men's singlesen.wikipedia.org
  8. 8Carlos Alcaraz, Alexander Zverev lead men's singles draw...usopen.org
  9. 9US Open: Draw, schedule, results from the final Grand...skysports.com

4. Market Data

Contract Snapshot

The market resolves to "Yes" for the player who wins the 2026 U.S. Open Men's Singles Tournament. A "No" resolution is triggered for any listed player if it becomes impossible for them to win the tournament. The tournament is scheduled from August 23 to September 13, 2026; if it's cancelled, postponed after October 31, 2026, or no winner is declared by then, the market resolves to "Other." Resolution relies primarily on official U.S. Open information, supplemented by a consensus of credible reporting.

Market Discussion

The market discussion indicates Carlos Alcaraz (34%) and Alexander Zverev (23.8%) are the top contenders for the 2026 Men's US Open title. Alcaraz's strong return from injury and Jannik Sinner's withdrawal are seen as boosts, while Zverev benefits from being the top seed, recent major success, and favorable draw. Arguments against strong certainty for any single player include the overall competitiveness of the field, variable player match sharpness, and the unpredictable nature of best-of-five set matches on Laykold courts.

5. Trust Index

This scorecard was computed Sep 12, 2026 and may not reflect current market conditions.

Octagon Trust Index Polymarket 72 Good

Settlement is decided by a token-holder vote.

Integrity risk· Outcome control

How it adds up
Integrity80% of score69Caution
Trade quality20% of score84Good

Includes the cost to trade: a $10,000 order loses about 1% of the price to slippage.

Trust score72Good

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity5 screens run · 4 don't apply · 1 awaiting data
Market integrity
65Caution

Outcome can be influenced

Outcome controlStructural risk · high confidence

Settlement is decided by a token-holder vote.

Large tradesTrade signals · medium confidence

Largest single print on will-novak-djokovic-win-the-2026-mens-us-open carried 55% of its 300,853-contract tape (contract holds 6.8% of the event's money; print is 13d old)

Screened clean
Participant influenceNo conflicted participant detected. Clear
Thin-volume movesMoves carried volume Clear
Size patternsTrade sizes look organic. Clear
1 screen not run
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · data source not connected
Resolution quality
60Caution

Settlement depends on token voting

No suspicious activity on any screen

Resolution rules read: Clear

Settlement is decided by a token-holder vote.

Liquidity
90Deep

Size fills near the screen price

3 contracts · worst first · 46 settled or closed — not scored

Casper Ruud29
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Ben Shelton90
Deep · high confidence

Typical bar range 0.2% of price over 11 traded bars

24h traded notional $36,509 · 24h
Alexander Zverev91
Deep · high confidence

Typical bar range 0.3% of price over 11 traded bars

Book spread 2% vs realized 0%
Move quality
70Stable

No significant moves

3 contracts · worst first · 46 settled or closed — not scored

Alexander Zverev—
No significant move (6h)

Price was stable over the last 6 hours.

Ben Shelton—
No significant move (6h)

Price was stable over the last 6 hours.

Casper Ruud—
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

3 contracts · worst first · 46 settled or closed — not scored

Alexander Zverev100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Ben Shelton100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Casper Ruud100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
84Good

Order book supports trading

Deep and tight enough to trade efficiently.

Outcome quality 90 (notional-weighted across 3 scored legs)

$100 order: 0.5c slippage (<1% of a 57.5c contract)

$1,000 order: 0.5c slippage (<1% of a 57.5c contract)

$10,000 order: 0.6c slippage (~1% of a 57.5c contract)

46 settled or closed — not scored

Alexander Zverev91Market scoreLiquidity91Move quality–Rule clarity100
Why 91
Liquidity
91 · Deep · high confidence

Typical bar range 0.3% of price over 11 traded bars

Book spread 2% vs realized 0%
Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Ben Shelton90Market scoreLiquidity90Move quality–Rule clarity100
Why 90
Liquidity
90 · Deep · high confidence

Typical bar range 0.2% of price over 11 traded bars

24h traded notional $36,509 · 24h
Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Casper Ruud29Market scoreLiquidity29Move quality–Rule clarity100
Why 29
Liquidity
29 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 12, 2026

6. How do top contenders Carlos Alcaraz and Alexander Zverev compare in career head-to-head performance on hard courts?

Overall Head-to-Head RecordAlexander Zverev leads Carlos Alcaraz 6-5 (as of Sep 1, 2026) [1]
Zverev's 2026 US Open Title Probability22.9% [2]
2026 US Open Prediction Market FavoriteJannik Sinner [3][4]
Alexander Zverev currently leads Carlos Alcaraz in their career head-to-head encounters. As of September 1, 2026, Zverev holds a 6-5 advantage in match victories [1]. On hard courts, Zverev has recorded notable wins against Alcaraz, including the 2021 Vienna semifinals, the 2021 Acapulco Round of 32, the 2024 ATP Finals, and a 2025 Cincinnati semifinal [5][6][7][1]. Alcaraz has also achieved significant hard-court victories, such as the 2024 Australian Open quarterfinal, the 2025 Cincinnati Masters semifinal, and a 2026 Australian Open semifinal [5][6][7][1].
Jannik Sinner is the top contender for the 2026 US Open. Leading up to the tournament, prediction markets indicate Sinner as the foremost favorite [3][4]. Carlos Alcaraz and Alexander Zverev are both recognized as strong potential winners, though their projected probabilities are lower than Sinner's [3][4]. Specifically, Alexander Zverev is forecast with a 22.9% predicted probability of winning the 2026 US Open title, placing him among the significant contenders [2].
Sources (7)
  1. 1Carlos Alcaraz VS Alexander Zverev | Head 2 Head | H2Hatptour.com
  2. 2Tennis Abstract: 2026 US Open Men's Draw Forecast Forecasttennisabstract.com
  3. 32026 Men’s US Open Winner (Tennis) Odds: Jannik Sinner Leads at 44% | Live Oddspredictioncircle.com
  4. 42026 Men’s US Open Winner (Tennis)? Odds & Prediction Markets | PredictionHeropredictionhero.com
  5. 5Alexander Zverev VS Carlos Alcaraz | Head 2 Head | H2Hatptour.com
  6. 6Alexander Zverev vs Carlos Alcaraz H2H - Tennis Stats,...tennisratio.com
  7. 7H2H Carlos Alcaraz Vs Alexander Zverev stats, prediction,...tennistonic.com

7. What does Daniil Medvedev's historical performance and win-loss record at the US Open indicate about his potential in the 2026 tournament?

US Open Career Win-Loss Record33-9 (.786) as of 2026 [1]
US Open Titles1 (2021) [2]
2026 US Open Winning Probability3.8% (Tennis Abstract) [3]
Daniil Medvedev exhibits a strong historical record at the US Open. He holds a career win-loss record of 33-9 (.786) at the tournament as of 2026 [1]. This consistent performance is highlighted by his victory in the 2021 tournament and reaching the finals in both 2019 and 2023 [2][4]. These past successes underscore his status as a formidable competitor at the event.
Despite past success, Medvedev faces low odds for the 2026 title. As of September 1, 2026, he has advanced to the second round of the current US Open [5]. However, various prediction markets currently assign him a very low probability of winning the 2026 Men's US Open, generally ranging from 2-5% [6][7][8][9]. Specifically, Tennis Abstract's forecast indicates a 3.8% chance of him winning the 2026 tournament, with further estimates of a 35.7% likelihood for reaching the quarterfinals and 17.0% for the semifinals [3].
Sources (9)
  1. 1Tennis Abstract: Daniil Medvedev Match Results, Splits, and Analysistennisabstract.com
  2. 2Daniil Medvedev career statisticsen.wikipedia.org
  3. 3Tennis Abstract: 2026 US Open Men's Draw Forecast Forecasttennisabstract.com
  4. 4Daniil MEDVEDEV - Tennis Titles, Ranking & Profilerolandgarros.com
  5. 5Drama-free Medvedev eases into US Open second roundreuters.com
  6. 6Will Daniil Medvedev win the 2026 Men's US Open? | Paritypredictparity.com
  7. 7Will Daniil Medvedev win the 2026 Men's US Open?… | Frenzy Capitalfrenzycap.com
  8. 82026 Men’s US Open Winner (Tennis) Odds & Prediction Market Analysis | CryptoSlatecryptoslate.com
  9. 92026 Men's Singles US Open Winner - Prediction Marketsrobinhood.com

8. How has the 2026 US Open draw, including early-round upsets, impacted the probable paths to the final for Carlos Alcaraz and Daniil Medvedev?

Carlos Alcaraz implied win probability26-35% [1][2][3]
Carlos Alcaraz semi-final probability24.4% [4]
Daniil Medvedev implied win probability2-3% [5]
Carlos Alcaraz's path to the final looks favorable due to recent events. As the second seed and defending champion, he is the betting favorite for the 2026 US Open, with an implied probability of winning ranging from 26% to 35% [1][2][3][6][5]. This position is further strengthened by his strong track record and the withdrawal of Jannik Sinner, previously a pre-tournament favorite, due to a right knee injury [1][2][3][6][5]. The early-round upset of Novak Djokovic by Mariano Navone also potentially removes a significant obstacle in the bottom half of the draw, as Alcaraz could have faced Djokovic in the semi-finals [7][8][9]. Current models predict Alcaraz has a 24.4% chance to reach the semi-finals and a 6.7% probability of winning the tournament [4].
Daniil Medvedev enters the tournament as a significant underdog with a less clear path. The 2021 US Open champion is the No. 8 seed, with prediction markets assigning him an implied probability of approximately 2-3% to win the 2026 US Open [5][7]. His forecasted probability of reaching the semi-finals stands at 17.0%, and his probability of winning the tournament is 3.8% [4]. While Novak Djokovic's early exit could generally benefit other top players by eliminating a major competitor from the bottom half of the draw, the available research does not detail the specific impact on Medvedev's individual route to the final [8][9].
Sources (9)
  1. 12026 Men’s US Open Winner (Tennis) Predictions & Odds | Polymarketpolymarket.com
  2. 2US Open Men's Singles Winner Odds & Predictions 2026kalshi.com
  3. 3US Open odds 2026: Carlos Alcaraz, Aryna Sabalenka...usatoday.com
  4. 42026 US Open Men's Draw Forecasttennisabstract.com
  5. 5US Open Tennis 2026 Odds: Where Kalshi And Polymarket...oddsshopper.com
  6. 6https://polymarket.com/event/2026-mens-us-open-winner-tennis/will-daniil-medvedev-win-the-2026-mens-us-openpolymarket.com
  7. 7Alcaraz returns for title defence; Djokovic, Zverev loom at...atptour.com
  8. 8Navone stuns physically ailing Djokovic at US Openatptour.com
  9. 9Five shocking facts about seismic Djokovic upset at US Openatptour.com

9. Are there any lingering injury concerns or notable dips in performance for top seeds like Alexander Zverev or Jannik Sinner heading into the second week of the 2026 US Open?

Jannik Sinner StatusWithdrew from 2026 US Open due to persistent right knee injury [1][2][3]
Alexander Zverev StatusCompeting as top seed, won Roland Garros, reached Wimbledon final, no new injury concerns [4][5][6]
Carlos Alcaraz StatusReturned after four-month layoff due to right wrist injury [7][8][9][6]
Jannik Sinner will not compete in the 2026 US Open due to injury. He withdrew from the tournament because of a persistent right knee injury [1][2][3]. Consequently, there are no ongoing injury concerns for Sinner as he is not participating in the event.
Alexander Zverev enters the second week with strong form and no new injury concerns. Competing as the top seed, he is reported to be in top form, having won his first major at Roland Garros and reaching the Wimbledon final [4][5]. There are no notable reports of new injury concerns for Zverev heading into the second week of the tournament [5][6]. He is considered one of the primary favorites for the title, despite downplaying his own status [4][10][11][12].
Other top seeds have faced physical challenges, influencing pre-tournament predictions. Carlos Alcaraz returned to competition after a four-month layoff due to a right wrist injury, and Novak Djokovic reportedly struggled physically during his first-round match [7][8][9][6]. Despite Zverev's strong form, prediction markets at the start of the tournament listed Alcaraz with a higher implied probability of winning compared to Zverev [13][11][12][14].
Sources (14)
  1. 1Jannik Sinner withdraws from the US Open | ATP Tour | Tennisatptour.com
  2. 2Jannik Sinner Withdraws From US Open Due to Ongoing Knee Injurysi.com
  3. 3Will Carlos Alcaraz and Jannik Sinner Play in the US Open? (Updated)complex.com
  4. 4US Open top seed Zverev downplays favorite status - Yahoo Sportssports.yahoo.com
  5. 5Alcaraz returns for title defence; Djokovic, Zverev loom at...atptour.com
  6. 6Alcaraz, Djokovic in same half of US Open drawatptour.com
  7. 7Navone stuns physically ailing Djokovic at US Openatptour.com
  8. 8Carlos Alcaraz's journey back to action at the US Openatptour.com
  9. 9Carlos Alcaraz ready for return at US Open: 'It wasn't an...atptour.com
  10. 10US Open experts' picks: Who will win?espn.com
  11. 11US Open Men's Odds 2026: Predictions, Picks and Best Betsrg.org
  12. 12US Open Predictions, Picks & Odds 2026sports.yahoo.com
  13. 13https://polymarket.com/event/2026-mens-us-open-winner-tennis/will-alexander-zverev-win-the-2026-mens-us-openpolymarket.com
  14. 142026 Men’s US Open Winner (Tennis) Predictions & Odds | Polymarketpolymarket.com

10. What recent performance metrics from the 2026 season justify Jannik Sinner's status as a leading favorite for the US Open title?

2026 Grand Slam Titles1 (Wimbledon) [1]
2026 Match Record44-3 through July 13 [2]
ATP World RankingNo. 1 with 13,450 points as of September 2026 [2][3]
Jannik Sinner’s dominant 2026 season performance solidified his status as a top US Open contender. Prior to the tournament, Sinner had an exceptional 2026 season, marked by his fifth career Grand Slam title at Wimbledon in July [1]. His historic success at ATP Masters 1000 events included winning the Sunshine Double (Indian Wells and Miami) without dropping a set, alongside additional titles in Monte-Carlo and Rome [1][4][5][6][7]. As of July 13, 2026, he led the ATP with 44 match wins (44-3 record), 6 singles titles, and 10 victories against Top 10 opponents [2]. He also maintained a perfect 29-0 record in ATP Masters 1000 matches up to mid-July [2]. Statistically, Sinner demonstrated elite dominance, winning approximately 94.3% of his service games and achieving a 31.9% return-game win rate, supported by an overhauled serve that boosted his ace count [1][5][8]. He held the World No. 1 ranking in the PIF ATP Rankings, with 13,450 points as of September 2026 [2][3], and was the initial market favorite for the US Open with odds often exceeding 50% in July [9][10].
However, a right knee injury forced his withdrawal from the competition. Despite his overwhelming achievements and high expectations, Jannik Sinner ultimately withdrew from the 2026 US Open due to a right knee injury and did not compete [9][11][10][12].
Sources (12)
  1. 1How Jannik Sinner is defying statistical normsatptour.com
  2. 2[click here and type in Recipient's Full Name]atptour.com
  3. 3ATP Live Rankings | PIF ATP Rankings (Singles)atptour.com
  4. 4Italian Open 2026 tennis: Jannik Sinner wins record 32nd...olympics.com
  5. 5Jannik Sinner has been hailed as nearly untouchable...facebook.com
  6. 6Jannik Sinner completes perfect run, wins Indian Wellsatptour.com
  7. 7Sinner overcomes Alcaraz, wins Monte-Carlo crownatptour.com
  8. 8Jannik Sinner - ATP Tennis Stats, Ranking, Career History...tennisratio.com
  9. 9U.S. Open preview 2026: 30 tennis champions, contenders...nytimes.com
  10. 102026 US Open Men's Winner: Sinner Leads as Alcaraz Faces Injury | PolyVeritaspolyveritas.com
  11. 11US Open Tennis Withdrawals 2026: 20 Out, Kalshi's Boardoddsshopper.com
  12. 12Jannik Sinner | Overview | ATP Tour | Tennisatptour.com

11. What Could Change the Odds

Key Catalysts

The 2026 US Open commenced on August 30, 2026, and is currently in progress as of September 1, 2026, with the tournament scheduled to run through September 13, 2026 [1]. US Open Fan Week also began this weekend, spanning Sunday to Saturday [2][3]. The men's singles winner has not yet been determined, as the event is still ongoing [4][5][6][7][8][9][1].
Key upcoming dates include the women's singles final on Saturday, September 12, 2026, and the men's singles final on Sunday, September 13, 2026 [6][7][10]. Noteworthy contenders in the 2026 field include defending champion Carlos Alcaraz, top seed Alexander Zverev, and Novak Djokovic [11].

Key Dates & Catalysts

  • Closes: September 13, 2026
Sources (11)
  1. 1What is the US Open schedule? | ATP Tour | Tennisatptour.com
  2. 2Bloomberg Money: Bond Moves, Social Security and the US Open | Bloomberg Intelligenceyoutube.com
  3. 3Bloomberg Money: Bond Moves, Social Security and the US Open | Bloomberg Surveillanceyoutube.com
  4. 42026 US Open – Men's singlesen.wikipedia.org
  5. 52026 US Open (tennis)en.wikipedia.org
  6. 6Official Site of the 2026 US Open Tennis Championshipsusopen.org
  7. 72026 US Open Tennis Schedule: Dates & Match Timesroadtrips.com
  8. 8How to follow US Open on the BBCbbc.com
  9. 9What were the US Open results? | ATP Tour | Tennisatptour.com
  10. 102026 US Open Order of Play: Daily Schedule & Sessionssportsbrackets.net
  11. 11Alcaraz returns for title defence; Djokovic, Zverev loom at...atptour.com