Roland Garros WTA: Marta Kostyuk vs Iga Swiatek

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Market context

Marta Kostyuk faces Iga Swiatek in the women's singles draw at Roland Garros, scheduled for 31 May 2026. The market currently prices Kostyuk's advancement at 30%, implying Swiatek as the heavy favourite. This represents a best-of-three-sets match; the winner progresses to the next round of the tournament.

Swiatek's historical record at Roland Garros provides the primary reference point for assessing the 70% implied probability favouring her. She won the title in 2022 and has reached the final on multiple occasions, with a career clay-court win rate substantially above her performance on other surfaces. Kostyuk, whilst a rising talent with improved consistency, has not demonstrated comparable success at Grand Slams, particularly on clay. Head-to-head records between players of differing clay-court pedigrees typically show wider probability spreads than the current 40-point gap, suggesting the market may be pricing in specific form considerations or recent tournament results that warrant tracking through May.

Traders should monitor both players' performance in the lead-up weeks—particularly results from Madrid and Rome, which immediately precede Roland Garros and serve as reliable indicators of clay-court sharpness. Injury reports and practice-court observations released by tournament organisers in the days before 31 May will influence conditional order placement. The settlement window closes 7 June, allowing a one-week buffer for potential delays, though Roland Garros typically maintains its schedule. Programmatic approaches should account for the possibility of walkover advancement if either player withdraws before the match begins.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Bot UK, which mirrors the Polymarket order book directly.

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 Bot 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 Bot 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.

What does it cost to trade on Polymarket Bot UK?

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

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.

Do I need to KYC for this market?

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