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OPEN INTEREST:
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402,751
Markets across
30,217
events
MATCHED EVENTS:
2,632
PLATFORM COVERAGE:
5
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VS.
Kalshi:
61%
Closed: Sep 8, 2:36 AM EST
Polymarket
This market refers to the tennis match between Kazushi Idogaki and Seiya Nakanishi in the M25 Sapporo, Main Draw, originally scheduled for September 7, 2026 at 10:00PM ET. This market will resolve to 'Kazushi Idogaki' if Kazushi Idogaki advances against Seiya Nakanishi. This market will resolve to 'Seiya Nakanishi' if Seiya Nakanishi advances against Kazushi Idogaki. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 21, 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 Kazushi Idogaki and Seiya Nakanishi in the M25 Sapporo, Main Draw, originally scheduled for September 7, 2026 at 10:00PM ET. This market will resolve to 'Kazushi Idogaki' if Kazushi Idogaki advances against Seiya Nakanishi. This market will resolve to 'Seiya Nakanishi' if Seiya Nakanishi advances against Kazushi Idogaki. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 21, 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 a different kind of wisdom than those found at sportsbooks. Sportsbooks set lines to balance action and incorporate a profit margin, while this market aggregates the beliefs of a diverse group of traders. If a significant number of informed bettors believe a sportsbook is mispricing the Idogaki vs Nakanishi match, we might see divergence between the two. Generally, prediction markets can offer a valuable alternative perspective, potentially identifying discrepancies in conventional odds and offering a more accurate forecast of the event’s outcome.
On Polymarket, this market is priced through a continuous auction mechanism, where traders buy and sell shares representing their belief in the probability of a particular outcome. As more shares are bought for one 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 price of a share directly corresponds to the implied probability of that outcome occurring. Therefore, the market price is a dynamic representation of collective intelligence, constantly adjusting based on new information and trader sentiment regarding the Idogaki vs Nakanishi match.
This market resolves around Sep 15, 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 Kazushi Idogaki and Seiya Nakanishi. The platform will verify the result against established sources to determine the winning outcome. Traders who correctly predicted the result will be entitled to a payout based on the final share price at the time of resolution for this market.
Several factors could influence trading activity in this market before Sep 15, 2026. Any news regarding the physical condition of either Kazushi Idogaki or Seiya Nakanishi, such as injuries or illness, would likely cause significant movement. Changes in publicly available performance statistics or expert analysis could also shift trader sentiment. Unexpected developments in the broader sporting landscape, or even weather conditions on the day of the match, could also impact the perceived probabilities and drive trading volume in this market.