TOTAL VOLUME:
$134.1b
24H VOL:
$113,466,932
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,423,222,590
402,751
Markets across
30,217
events
MATCHED EVENTS:
2,632
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 22, 12:24 AM EST
Polymarket
This market refers to the tennis match between Sayaka Ishii and Rira Kosaka in the W50 Nanao, Qualifying, originally scheduled for September 21, 2026 at 10:00PM ET. This market will resolve to 'Sayaka Ishii' if Sayaka Ishii advances against Rira Kosaka. This market will resolve to 'Rira Kosaka' if Rira Kosaka advances against Sayaka Ishii. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 5, 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 Sayaka Ishii and Rira Kosaka in the W50 Nanao, Qualifying, originally scheduled for September 21, 2026 at 10:00PM ET. This market will resolve to 'Sayaka Ishii' if Sayaka Ishii advances against Rira Kosaka. This market will resolve to 'Rira Kosaka' if Rira Kosaka advances against Sayaka Ishii. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 5, 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.
Generally, prediction market odds often reflect a more accurate forecast than traditional sportsbook odds, as they aggregate the wisdom of the crowd. However, it’s important to remember that both represent probabilities based on available information. Discrepancies can arise due to differing information sources, biases, or market inefficiencies. While sportsbooks may set initial lines based on expert analysis, this market allows anyone to participate and express their belief about the outcome, potentially leading to a different assessment of the likely winner of the Sayaka Ishii vs Rira Kosaka match.
On Polymarket, this market is priced through a continuous auction mechanism where traders buy and sell shares representing their belief in the outcome. The price of a share directly corresponds to the probability of that outcome occurring. As more traders 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 movements are driven entirely by supply and demand, offering a dynamic representation of collective predictions for the Sayaka Ishii vs Rira Kosaka match.
This market resolves around Sep 29, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. The resolution will be based on the official result of the Sayaka Ishii vs Rira Kosaka match, as reported by the governing sports organization. The platform will verify the result against established sources to ensure accuracy and transparency. Traders who correctly predicted the 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 the Sayaka Ishii vs Rira Kosaka match takes place. News regarding player injuries, changes in training regimens, or any significant updates about the competitors’ condition could all impact trading activity. Unexpected announcements about match scheduling or venue changes could also cause price fluctuations. Public sentiment, reflected in social media discussions and expert analysis, may also play a role in shifting market confidence and driving price movements in this market.