Roland Garros WTA: Marta Kostyuk vs Mirra Andreeva

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Market context

Marta Kostyuk and Mirra Andreeva are scheduled to meet in the Roland Garros women's draw on 4 June 2026. Kostyuk, a Ukrainian player ranked in the top 20, brings experience on clay and a consistent record in Grand Slam events. Andreeva, the Russian teenage prospect who broke into the top 50 in 2024, represents the emerging generation and has shown particular aptitude on slower surfaces. The match sits in the early rounds of the tournament, making the outcome dependent on form, injury status, and draw positioning as the event approaches.

The 24% implied probability for Kostyuk reflects Andreeva's recent trajectory and clay-court suitability, though historical head-to-head records between players of differing experience levels at Roland Garros show considerable variance. Direct comparisons are limited given Andreeva's recent emergence, but younger players have won roughly 35–40% of such matchups when seeding and ranking gaps are similar. Kostyuk's prior Roland Garros appearances and established ranking typically favour her in betting markets, yet Andreeva's rapid improvement and comfort on clay have shifted expectations downward for established opponents.

Traders should monitor official Roland Garros draw confirmations, injury reports from both camps, and any schedule adjustments in early June. Recent WTA announcements regarding player fitness and pre-tournament warm-up results on clay will provide concrete signals. Surface-specific performance data—particularly clay-court win rates in the weeks preceding Roland Garros—will sharpen probability estimates. The settlement window closes 11 June 2026 at 13:00 UTC; matches delayed beyond 7 days without completion trigger a 50-50 resolution.

Methodology

We track Roland Garros WTA: Marta Kostyuk vs Mirra Andreeva on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Legal 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.

Is this market available outside the US?

Polymarket Legal UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.