About This Market
Rei Sakamoto vs.
Rei Sakamoto vs. Kei Nishikori: ATP Tennis match held on 2026-08-27. Review the historical prediction market odds from Kalshi, Polymarket, and more on Prediction.com.
Rei Sakamoto vs. Kei Nishikori
Rei Sakamoto vs. Kei Nishikori
Live prediction market odds for Rei Sakamoto vs. Kei Nishikori. Compare prices across .
ATP Listed Resolved
This market resolved on Aug 28, 2026. Rei Sakamoto was the officially declared outcome.
Rei Sakamoto vs.
Rei Sakamoto vs. Kei Nishikori: ATP Tennis match held on 2026-08-27. Review the historical prediction market odds from Kalshi, Polymarket, and more on Prediction.com.
| Question | Result |
|---|---|
Rei SakamotoWINNER | Yes |
Kei Nishikori | No |
Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket and Polymarket US and ProphetX.
KalshiIf Kei Nishikori wins the Nishikori vs Sakamoto professional tennis match in the 2026 US Open Men Singles Qualification Final after a ball has been played, then the market resolves to Yes.
The following market refers to the Nishikori vs Sakamoto professional tennis match in the 2026 US Open Men Singles Qualification Final after a ball has been played. If the match does not occur (signaled by a ball being played) due to a player injury, walkover, forfeiture, or any other cancellation (all before the match starts), the market will resolve to a fair price in accordance with the rules. If this match is postponed or delayed, the market will remain open and close after the rescheduled match has finished (within two weeks). Kalshi is not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Governing League. All trademarks, logos, and brand names are the property of their respective owners.
PolymarketThis market refers to the tennis match between Kei Nishikori and Rei Sakamoto in the US Open, Qualification ATP, originally scheduled for August 27, 2026 at 11:00AM ET. This market will resolve to 'Kei Nishikori' if Kei Nishikori advances against Rei Sakamoto. This market will resolve to 'Rei Sakamoto' if Rei Sakamoto advances against Kei Nishikori. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 10, 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.
Polymarket USThis market will settle to the winner of the Kei Nishikori vs Rei Sakamoto ATP match scheduled for August 27 at 11:00AM. If the match does not begin due to a walkover, forfeit, injury, or any other cancellation prior to the first point being played, the market will settle to fair market price. If a player retires during the match, the opponent will be recorded as the winner. Outcome sourced from ATP.
ProphetXSports moneyline - resolves based on official game outcome per ProphetX Prediction Rules
The outcomes listed above show how traders are pricing this question. Venue prices are not currently available on this page. Each price reflects the market’s implied probability, not a guaranteed result. This event is archived; prices shown are historical.
No historical prices are available on this page. The last available price is not necessarily the final settlement price.
Venues have different traders, liquidity and fees, so their prices can differ. A cross-platform comparison needs available prices for the same outcome on at least two venues.
For example, a 40¢ price implies about a 40% chance. For a standard $1 contract, a share pays $1 if its outcome settles as correct and $0 if it settles as incorrect. A winning share bought at 40¢ earns 60¢ before fees. Check each venue’s settlement rules, fees and eligibility before trading. Historical prices alone do not identify the winning outcome.