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, the Ukrainian left-hander ranked in the top 20, has established herself as a consistent clay-court performer with multiple WTA titles and regular deep runs at Grand Slams. Andreeva, the Russian teenager who burst onto the professional scene in 2023, has already reached multiple Grand Slam quarter-finals despite her age and continues to climb the rankings rapidly. Their matchup represents a generational clash between an established mid-tier contender and an emerging talent with exceptional upside.

Head-to-head records between players at this career stage offer limited predictive value when one competitor is still in their early twenties and developing rapidly. Andreeva's trajectory has been steep—she reached the Australian Open quarter-final as a teenager and has shown composure in high-pressure environments. Kostyuk's consistency on clay and experience in major tournaments provide a baseline advantage, though Andreeva's recent form and ceiling suggest this is not a mismatch. The 55 per cent implied probability for Kostyuk reflects genuine uncertainty rather than a clear favourite.

Traders should monitor both players' form in the weeks preceding Roland Garros, particularly their results on clay courts during the spring circuit. Injury updates are critical, especially for Kostyuk given the physical demands she places on her body. Andreeva's confidence heading into the tournament—shaped by her results in May—will influence her tactical approach. Court conditions at Roland Garros, which can favour either aggressive or defensive players depending on clay speed and bounce, may prove decisive in a close encounter between contrasting styles.

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

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

Is this market available outside the US?

Sport Prediction 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.

What does it cost to trade on Sport Prediction?

Zero. Sport Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

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