TOTAL VOLUME:
$134.1b
24H VOL:
$133,388,117
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,436,095,462
405,232
Markets across
30,526
events
MATCHED EVENTS:
2,693
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 18, 2:18 PM EST
Polymarket
This market refers to the tennis match between Teodora Kostovic and Kaitlin Quevedo in the Sao Paulo Open, originally scheduled for September 18, 2026 at 9:00AM ET. This market will resolve to 'Teodora Kostovic' if Teodora Kostovic advances against Kaitlin Quevedo. This market will resolve to 'Kaitlin Quevedo' if Kaitlin Quevedo advances against Teodora Kostovic. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 2, 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 Teodora Kostovic and Kaitlin Quevedo in the Sao Paulo Open, originally scheduled for September 18, 2026 at 9:00AM ET. This market will resolve to 'Teodora Kostovic' if Teodora Kostovic advances against Kaitlin Quevedo. This market will resolve to 'Kaitlin Quevedo' if Kaitlin Quevedo advances against Teodora Kostovic. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 2, 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 wisdom of the crowd, potentially differing from those set by sportsbooks. Sportsbooks establish initial lines based on their own analysis, aiming to balance action on both sides. This market, however, allows anyone to express their belief about the outcome, and the resulting odds can diverge from sportsbook lines if a significant number of participants hold a different view. These discrepancies can sometimes present opportunities for arbitrage, although transaction fees and market liquidity should be considered. It's possible to see prediction markets more accurately forecast events than traditional sources.
On Polymarket, this market is priced through a continuous auction mechanism. Traders buy and sell shares representing their belief in the probability of a particular outcome. As more shares are purchased for one outcome, its price increases, reflecting a higher perceived chance of occurring. 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, allowing traders to easily assess the market's expectation. This dynamic pricing ensures that the market reflects the collective intelligence of all participants, constantly adjusting as new information becomes available.
This market resolves around Sep 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 Sao Paulo Open match between Teodora Kostovic and Kaitlin Quevedo. The platform will verify the winner against official tournament records and reporting from reputable sports news sources. The final price of shares will then reflect the actual outcome, with shares in the winning outcome paying out close to 100 cents and shares in the losing outcome expiring worthless.
Several factors could influence this market before resolution. Any news regarding player form, such as injury updates for either Kostovic or Quevedo, would likely cause significant price movement. Changes in weather conditions at the Sao Paulo Open could also impact expectations, particularly if one player is more affected by certain conditions than the other. Unexpected results in earlier rounds of the tournament, potentially shifting perceptions of overall player strength, could also move the market. Finally, large trading volume from informed participants could signal new information or a shift in sentiment.