TOTAL VOLUME:
$134.2b
24H VOL:
$134,145,987
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,441,166,947
406,422
Markets across
30,383
events
MATCHED EVENTS:
2,688
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
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Quentin Halys
- Kalshi
Quentin Halys - Kalshi
1W
News
Positive
Negative
Neutral
Hover marker for details
Vol.
·
Resolved Aug 27, 2026
Closed: Aug 31, 10:15 PM EST
Kalshi
Kingston 2: Aidan Mayo vs Andres Martin Match O/U 23.5
Kingston 2: Aidan Mayo vs Andres Martin Set 2 Winner
Kingston 2: Aidan Mayo vs Andres Martin Set 2 O/U 8.5
Kingston 2: Aidan Mayo vs Andres Martin Set 1 Winner
Kingston 2: Aidan Mayo vs Andres Martin Set 1 O/U 8.5
Kingston 2: Aidan Mayo vs Andres Martin Total Sets: O/U 2.5
Kingston 2: Aidan Mayo vs Andres Martin Set 2 O/U 9.5
Kingston 2: Aidan Mayo vs Andres Martin Set 1 O/U 9.5
Kingston 2: Aidan Mayo vs Andres Martin Set Handicap +/-1.5
Kingston 2: Aidan Mayo vs Andres Martin Set Handicap +/-1.5
Intro
This market tracks the outcome of the tennis match between Quentin Halys and Facundo Diaz Acosta at the 2026 US Open Men Singles Round Of 128. The aggregated consensus probability for Quentin Halys to win is 80.0%, with Facundo Diaz Acosta at 19.0%, drawing data from Polymarket, Limitless, and Kalshi, and resolving against official US Open results. Watch for the match result on or around September 1, 2026, which will determine the market's final settlement.
PredictionHero - Resolution Divergence Alerts (RDA)
Unified Resolution Criteria (Consistent across platforms)
All markets across platforms share consistent resolution logic based on official ATP/Challenger statistics and US Open results, with clear rules for incomplete matches, cancellations, and tiebreak counting.Primary resolution logic: Official ATP Challenger statistics for Kingston 2 and official US Open results for Halys vs Diaz AcostaCore resolution logic:
- Match winner markets resolve to the declared winner based on official results
- Set winner and game total markets resolve based on completed play unless the match is canceled or incomplete
- Tiebreak games count as one game toward total game counts
- Markets remain open during postponements and resolve 50-50 for cancellations or incomplete matches unless outcome is already determined
Edge cases & clarifications:
- Match Cancellation: All markets resolve 50-50 unless outcome was already unconditionally determined before cancellation
- Incomplete Match: Markets resolve 50-50 unless completing the remaining games would guarantee the same outcome
- Walkover/Retirement: Match winner markets resolve to the advancing player, while completion-dependent markets resolve 50-50
Polymarket
This market refers to the tennis match between Aidan Mayo and Andres Martin in the Kingston 2, originally scheduled for August 28, 2026 at 11:00AM ET. This market will resolve to 'Aidan Mayo' if Aidan Mayo advances against Andres Martin. This market will resolve to 'Andres Martin' if Andres Martin advances against Aidan Mayo. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 11, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the ATP Tour. A consensus of credible reporting may also be used.
Kalshi
The event determines the winner of the Halys vs Diaz Acosta professional tennis match in the 2026 US Open Men Singles Round Of 128, resolving to Yes for the respective market if the designated player wins after play has commenced. If the match fails to start due to injury, walkover, forfeiture, or other cancellations before any ball is played, the market resolves to a fair price. Postponements or delays do not immediate close the market; it remains open and closes only after the rescheduled match concludes, with a two-week window for closure assurance. Kalshi disclaims any official affiliation with the governing league, and all trademarks remain property of their respective owners.
Limitless
This market refers to the tennis match between Quentin Halys and Facundo Diaz Acosta in the ATP US Open, originally scheduled for August 30, 2026 at 15:00 UTC. This market will resolve to "YES" if the total number of games completed across all sets equals or exceeds 37. Otherwise, it will resolve to "NO." All tiebreaks—including any Champions/Super tiebreak—count as one (1) game toward the total. If the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50.
