Roland Garros WTA: Marta Kostyuk vs Mirra Andreeva

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Market context

Kostyuk and Andreeva are scheduled to meet in the Roland Garros women's draw on 4 June 2026. The Polymarket contract currently prices Kostyuk's advancement at 54%, reflecting a tight matchup between the Ukrainian and Russian players. Settlement hinges on a completed match within the seven-day window; any cancellation, tie, or unresolved delay triggers a 50-50 split of the conditional USDC liquidity across both outcomes on Polygon.

Kostyuk has established herself as a consistent top-50 player with solid clay credentials, whilst Andreeva represents the emerging generation of Russian talent—she reached the Australian Open quarter-finals in January 2024 at age 16, signalling rapid development. Head-to-head records between rising players at Grand Slams often reflect recent form more than historical patterns; Kostyuk's experience on the Roland Garros surface and in high-pressure knockout rounds provides a structural advantage, though Andreeva's trajectory suggests narrowing margins. The 54% probability reflects genuine uncertainty rather than a clear favourite.

Traders should monitor the official Roland Garros draw confirmation and any weather disruptions to the Paris schedule in early June. Injury reports in the fortnight before the tournament carry outsized weight—either player withdrawing or playing injured would alter the match's competitive balance substantially. Court assignments and scheduling announcements typically arrive 48 hours before play; late changes to surface conditions or match timing can favour one player's preparation style. The settlement window closes 13 June at 13:00 UTC, allowing minimal buffer beyond the scheduled date.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.