TOTAL VOLUME:
$134.1b
24H VOL:
$141,541,542
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,440,096,988
406,065
Markets across
30,522
events
MATCHED EVENTS:
2,692
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 9, 11:10 PM EST
Polymarket
This market refers to the tennis match between Yu Tanaka and Keisuke Saitoh in the M25 Sapporo, Main Draw, originally scheduled for September 9, 2026 at 9:00PM ET. This market will resolve to 'Yu Tanaka' if Yu Tanaka advances against Keisuke Saitoh. This market will resolve to 'Keisuke Saitoh' if Keisuke Saitoh advances against Yu Tanaka. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 23, 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 International Tennis Federation (ITF). A consensus of credible reporting may also be used.
This market refers to the tennis match between Yu Tanaka and Keisuke Saitoh in the M25 Sapporo, Main Draw, originally scheduled for September 9, 2026 at 9:00PM ET. This market will resolve to 'Yu Tanaka' if Yu Tanaka advances against Keisuke Saitoh. This market will resolve to 'Keisuke Saitoh' if Keisuke Saitoh advances against Yu Tanaka. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 23, 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 International Tennis Federation (ITF). A consensus of credible reporting may also be used.
Prediction market odds often reflect the wisdom of the crowd, potentially differing from traditional sportsbook odds. Sportsbooks set lines based on their own models and aim to balance action on both sides, while this market allows anyone to express their belief about the outcome. If a significant discrepancy exists between prediction market probabilities and sportsbook odds, it could indicate that the market believes the sportsbook is mispricing the event, or that new information hasn't yet been fully incorporated into sportsbook lines. Examining these differences can provide valuable insights.
On Polymarket, this market is priced through a continuous auction mechanism, where traders buy and sell shares representing their belief about the outcome of the Tanaka vs Saitoh match. The price of a share directly corresponds to the probability of that outcome occurring. As more people buy shares in a particular outcome, its price increases, reflecting growing confidence. On Polymarket, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. The market's price dynamically adjusts based on supply and demand, providing a real-time assessment of the event's likelihood.
This market resolves around Sep 17, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. Resolution will be based on the official result of the M25 Sapporo match between Yu Tanaka and Keisuke Saitoh. The platform will verify the result against publicly available and reliable sources to determine the winning outcome. Traders holding shares in the correct outcome will be entitled to a payout based on the final market price at the time of resolution.
Several factors could influence the price of this market before Sep 17, 2026. Any news regarding the physical condition of either Yu Tanaka or Keisuke Saitoh, such as injuries or illness, would likely cause significant movement. Changes in publicly available rankings or performance statistics could also shift trader sentiment. Unexpected announcements about match conditions or venue changes might also impact the market. Ultimately, any information that alters perceptions of the athletes' chances of winning could lead to price fluctuations.