TOTAL VOLUME:
$154.6b
24H VOL:
$323,326,361
24H TRANSACTIONS:
2,984,640,614
OPEN INTEREST:
$1,969,435,260
419,363
Markets across
40,411
events
MATCHED EVENTS:
4,612
PLATFORM COVERAGE:
5
Polymarket:
37%
VS.
Kalshi:
63%
Closed: Oct 18, 1:01 AM EST
Polymarket
This market refers to the tennis match between Mary Stoiana and Sayaka Ishii in the Japan Women's Open, Qualification, originally scheduled for October 17, 2026 at 10:30PM ET. This market will resolve to 'Mary Stoiana' if Mary Stoiana advances against Sayaka Ishii. This market will resolve to 'Sayaka Ishii' if Sayaka Ishii advances against Mary Stoiana. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 31, 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 WTA Tour. A consensus of credible reporting may also be used.
This market refers to the tennis match between Mary Stoiana and Sayaka Ishii in the Japan Women's Open, Qualification, originally scheduled for October 17, 2026 at 10:30PM ET. This market will resolve to 'Mary Stoiana' if Mary Stoiana advances against Sayaka Ishii. This market will resolve to 'Sayaka Ishii' if Sayaka Ishii advances against Mary Stoiana. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 31, 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 WTA Tour. A consensus of credible reporting may also be used.
Prediction market odds often reflect the collective wisdom of a diverse group of traders, potentially offering a different perspective than traditional sportsbooks. Sportsbook odds are typically set by professional oddsmakers, while this market is driven by individual traders buying and selling contracts. It’s common to see discrepancies between the two, especially early in the market lifecycle, as prediction markets can incorporate information and analysis that sportsbooks may not immediately consider. Examining these differences can provide valuable insights for informed decision-making.
On Polymarket, this market is priced through a continuous auction mechanism where traders buy and sell contracts representing their belief about the outcome of the Stoiana vs Ishii match. The price of a contract reflects the probability of that outcome occurring, as perceived by the market participants. On Polymarket, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. As more traders participate and new information becomes available, the price adjusts accordingly, creating a dynamic and real-time assessment of the event's potential results. The current volume traded is $60,356.
This market resolves around Oct 25, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. Resolution will be based on the official result of the Mary Stoiana vs Sayaka Ishii match in the Japan Women's Open Qualification. The platform will verify the result against reliable sources to determine which outcome is the winner. Traders holding the winning contract will be paid out according to the final market price at resolution.
Several factors could influence the price of this market before Oct 25, 2026. Any news regarding player form, injuries, or changes in playing conditions could significantly shift trader sentiment. Unexpected announcements about the players’ strategies or coaching decisions could also cause movement. Furthermore, major shifts in public opinion, as reflected in polls or expert analysis, could impact trading activity and the perceived probability of each outcome. Monitoring these signals will be crucial for understanding potential price fluctuations.