Live prediction market odds for Iga Swiatek vs. Marta Kostyuk. Compare prices across Kalshi and Polymarket.
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Kalshi / Polymarket
2026-05-31
Iga Swiatek vs. Marta Kostyuk — WTA Tennis match scheduled for 2026-05-31. Compare live prediction market odds from Kalshi, Polymarket, and more on Prediction Hunt.
Iga Swiatek leads the “Iga Swiatek vs. Marta Kostyuk” event at 71.5% implied probability, followed by Marta Kostyuk at 29.0%. Platforms are tightly aligned at a 1.0% spread.
Iga Swiatek vs. Marta Kostyuk is a prediction market event currently tracked across 2 platforms (Kalshi, Polymarket). Iga Swiatek leads at 72% implied probability, making it the market favorite. Other contenders include Marta Kostyuk at 29%.
Iga Swiatek currently leads at 72% implied probability. Behind Iga Swiatek, Marta Kostyuk at 29% are the next closest contenders. Platforms were tightly aligned at a 1.0% spread, suggesting broad consensus on the odds.
Here are the latest odds across Kalshi, Polymarket: Iga Swiatek: 72¢ on Kalshi, 71¢ on Polymarket. Marta Kostyuk: 29¢ on Kalshi, 29¢ on Polymarket. Platforms are tightly aligned at a 1.0% spread, leaving little room for cross-platform arbitrage.
A price of 72¢ means the market estimates a 72% probability that Iga Swiatek will be the outcome. Buying one share at 72¢ pays out $1.00 if correct — a 39% return — or $0 if wrong. This is the core mechanic of prediction markets: the price directly reflects the crowd's probability estimate.
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Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket.
KalshiIf Marta Kostyuk wins the Kostyuk vs Swiatek professional tennis match in the 2026 French Open Women Singles Round Of 16 after a ball has been played, then the market resolves to Yes.
The following market refers to the Kostyuk vs Swiatek professional tennis match in the 2026 French Open Women Singles Round Of 16 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).
PolymarketThis market refers to the tennis match between Marta Kostyuk and Iga Swiatek in the Roland Garros WTA, originally scheduled for May 31, 2026 at 5:00AM ET. This market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Iga Swiatek. This market will resolve to 'Iga Swiatek' if Iga Swiatek advances against Marta Kostyuk. 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 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.
Iga Swiatek
71.5% avg
