Roland Garros WTA: Marta Kostyuk vs Iga Swiatek

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Market context

Marta Kostyuk faces Iga Swiatek in a Roland Garros women's singles match scheduled for 31 May 2026. The crowd-implied probability of 30% for Kostyuk reflects her status as a substantial underdog against the world's dominant clay-court player. Swiatek has won Roland Garros twice (2022, 2023) and remains the clear favourite on the Paris surface, where she has posted a 34–7 record across her career. Kostyuk, a Ukrainian left-hander ranked in the top 20, has improved considerably but lacks the clay-court pedigree and match record against elite opposition that would justify shorter odds.

Historically, Swiatek's Roland Garros dominance has been nearly unassailable; she has lost only once at the tournament since 2021 (to Marketa Vondrousova in 2023). Kostyuk's record against top-10 opponents on clay remains mixed, though she has shown resilience in other Grand Slams. The 30% implied probability for Kostyuk appears broadly aligned with her genuine chances—she would need to execute a near-flawless performance and catch Swiatek in an off day. Value traders should monitor pre-match fitness reports and draw conditions; any indication of injury or fatigue affecting Swiatek could shift the calculus materially. Kostyuk's recent form heading into Roland Garros and any late-tournament momentum would also merit close attention, though the structural advantage remains decisively with Swiatek.

Methodology

This page reviews Roland Garros WTA: Marta Kostyuk vs Iga Swiatek across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Who Will Win 2026 — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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