TOTAL VOLUME:
$134b
24H VOL:
$107,351,958
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,416,970,024
400,720
Markets across
30,097
events
MATCHED EVENTS:
2,633
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Jul 28, 6:00 AM EST
Polymarket
This market refers to the doubles tennis match between Stevenson/Willis and Arends/Pel in the Estoril Open, originally scheduled for July 21, 2026 at 6:00AM ET. This market will resolve to 'Stevenson/Willis' if the team of Stevenson/Willis advances against Arends/Pel. This market will resolve to 'Arends/Pel' if the team of Arends/Pel advances against Stevenson/Willis. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50. If the match begins but is not completed, and one team advances due to the opponent's retirement, default, or disqualification, this market will resolve to the team who advances. If the match ends in a walkover (a team 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.
This market refers to the doubles tennis match between Stevenson/Willis and Arends/Pel in the Estoril Open, originally scheduled for July 21, 2026 at 6:00AM ET. This market will resolve to 'Stevenson/Willis' if the team of Stevenson/Willis advances against Arends/Pel. This market will resolve to 'Arends/Pel' if the team of Arends/Pel advances against Stevenson/Willis. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50. If the match begins but is not completed, and one team advances due to the opponent's retirement, default, or disqualification, this market will resolve to the team who advances. If the match ends in a walkover (a team 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.
Prediction market odds and traditional sportsbook odds often diverge because they reflect different pricing mechanisms. Sportsbooks set lines to balance action and manage risk, while prediction markets allow traders to discover prices through open competition. For this market, comparing the implied probability here to major sportsbook spreads can reveal whether the crowd is pricing the outcome differently than professional oddsmakers. Prediction markets sometimes lead sportsbooks in incorporating late-breaking information, though both sources offer valuable signals.
On Polymarket, this market is priced through an automated market maker and order-book mechanism where traders directly buy or sell shares representing each outcome. On Polymarket, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. The current odds reflect the aggregate of all open positions and recent trades; as traders adjust their holdings based on new information or sentiment, the price updates in real time. Liquidity and trading volume influence how quickly prices move and how tight the bid-ask spread remains.
This market resolves around Jul 28, 2026, once the Stevenson/Willis vs Arends/Pel doubles match concludes and the result is confirmed. The outcome is determined by which team wins the match, verified against credible public sources covering professional tennis. Traders holding shares in the winning outcome receive their payout, while positions on the losing side expire worthless. Resolution typically occurs within hours of the final point.
Several factors could shift trader sentiment before the match begins. Injury reports or withdrawal announcements involving any of the four players would trigger sharp repricing. Recent form and head-to-head records between the pairs, published in sports media, often drive late trading activity. Weather conditions at the venue, court surface conditions, and lineup confirmations closer to match time can also influence odds. Breaking news about player fitness or coaching changes may spark volatility in the final hours before play starts.