TOTAL VOLUME:
$66b
24H VOL:
$398,877,831
24H TRANSACTIONS:
647,445,881
OPEN INTEREST:
$1,477,629,845
622,934
Markets across
14,083
events
MATCHED EVENTS:
1,257
PLATFORM COVERAGE:
4
Polymarket:
49%
VS.
Kalshi:
51%
2026 Women’s US Open Winner (Tennis)? Odds & Prediction Markets
Will Jasmine Paolini win the US Open Women's Singles?
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Intro
This market tracks which player will win the 2026 Women's US Open Tennis Singles Tournament. Across Polymarket and Kalshi, the consensus probability for Jasmine Paolini to claim the title stands at 44.0%, with Aryna Sabalenka at 29.5%. Resolution will be determined by the Official U.S. Open with credible reporting as secondary source. Watch the tournament conclusion on September 13, 2026, when the champion will be crowned and markets will settle.
PredictionHero - Resolution Divergence Alerts (RDA)
Unified Resolution Criteria (Consistent across platforms)
Primary resolution logic:
Official U.S. Open (https://www.usopen.org/index.html); consensus of credible reporting as secondary sourceCore resolution logic:
- Resolution occurs when the 2026 U.S. Open Women's Singles Tournament concludes with an official winner
- The winner is the player who wins the final match of the tournament bracket
- If a listed player becomes ineligible per tournament rules, their corresponding market resolves to No
- If the tournament is cancelled, postponed after October 31, 2026, or no winner is declared by that date, Polymarket resolves to Other; Kalshi binary markets (one per player) all resolve to No
- Polymarket includes an explicit Other option; Kalshi uses binary Yes/No per individual player, with all players resolving No if an unlisted player wins
Edge cases & Clarifications:
- Tournament Cancellation: If the 2026 U.S. Open is cancelled entirely, Polymarket resolves to Other. Kalshi binary markets for named players resolve to No. If a replacement tournament is held after October 31, 2026, both platforms treat it as no resolution within the specified window.
- Postponement Beyond October 31, 2026: If the tournament is postponed and the final is not completed by October 31, 2026, Polymarket resolves to Other. Kalshi binary markets resolve to No for all named players.
- Unlisted Player Wins: If a player not explicitly listed on either platform wins the tournament, Polymarket resolves to Other. Kalshi binary markets for all named players resolve to No.
- Player Ineligibility: If a listed player becomes ineligible per U.S. Open rules before or during the tournament, their corresponding market resolves to No on both platforms.
- Placeholder Players (A-Z Designations): Polymarket includes 26 placeholder markets (Player A through Player Z). These resolve to No unless the corresponding player identity is clarified and that player wins. Kalshi does not include placeholder markets.
Timing:
Resolution window: August 23 - September 13, 2026 (tournament dates). Final resolution deadline: October 31, 2026. Markets resolve immediately upon official announcement of the tournament winner by the U.S. Open.Polymarket
The 2026 U.S. Open tennis tournament is scheduled for August 23 - September 13, 2026. This market will resolve to the player that wins the 2026 U.S. Open Women’s Singles Tournament. If at any point it becomes impossible for a listed player to win the 2026 U.S. Open Women’s Singles Tournament per the rules of the tournament, the corresponding market will resolve to “No”. If the 2026 U.S. Open Women’s Singles Tournament is cancelled, postponed after October 31, 2026, or there is otherwise no winner declared within that timeframe, this market will resolve to “Other”. The primary resolution source will be official information from the U.S. Open (https://www.usopen.org/index.html); however, a consensus of credible reporting may also be used.
Kalshi
A participant's market resolves to Yes if they win the 2026 US Open Women's Singles professional tennis tournament. If a participant forfeits, withdraws from consideration, or takes any official action that removes them from being able to win the tournament, their market resolves to No.
Frequently asked questions
Prediction markets and traditional sportsbooks price the same event differently because they operate under distinct incentive structures. Sportsbooks set odds to balance liability and extract a margin, while prediction markets aggregate trader beliefs through continuous price discovery. Prediction markets often reflect sharper, more dynamic pricing because participants risk real capital on outcomes. However, sportsbooks may move faster on breaking news due to dedicated trading desks. Comparing both sources helps identify mispriced opportunities and validates whether this market's consensus aligns with professional betting markets.
Kalshi and Polymarket can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Platform differences stem from distinct user bases, liquidity pools, and contract specifications. Kalshi and Polymarket may attract traders with different risk tolerances, information sets, and time horizons. Liquidity concentration on one platform can cause its price to lag or lead the other, especially if one contract receives media attention or institutional flow. Regulatory frameworks and fee structures also influence how aggressively traders participate. Monitoring both venues reveals arbitrage signals and helps you understand which platform's pricing is more reliable for decision-making.
This market concludes on Sep 13, 2026. Resolution hinges on the official tournament result—specifically, which player wins the Women's US Open singles title. The outcome is determined by the match results and final champion as recognized by the United States Tennis Association and major sports data providers. Once the tournament concludes and the winner is confirmed, the market settles accordingly, and traders receive payouts based on their positions.
Player injuries, withdrawals, and form leading into the tournament are primary catalysts. Seeding announcements, head-to-head matchup draws, and recent Grand Slam results will shift trader sentiment. Off-court news—sponsorships, coaching changes, or personal circumstances—can also influence perception of a player's readiness. Court conditions and weather patterns at Flushing Meadows may favor certain playing styles. As the event approaches, each round's results will dramatically reprrice remaining contenders. Media coverage and betting flow from sportsbooks can amplify volatility, especially if an underdog makes a deep run.
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