Roland Garros WTA: Sara Bejlek vs Iga Swiatek

Platform comparison

Active sub-markets

Market context

Sara Bejlek, the Czech qualifier, faces top-seeded Iga Swiatek in the opening round of Roland Garros on 27 May 2026. Swiatek, a three-time French Open champion, enters as the overwhelming favourite in a matchup that reflects the gulf between a world number one and a player ranked outside the top 100. The 100% implied probability reflects the historical dominance of top seeds in early rounds at clay majors, where surface expertise and match sharpness compound the ranking differential.

Swiatek's recent form on clay has been consistent, though she missed portions of the spring season with injury management. Bejlek qualified for the main draw but carries minimal Grand Slam experience at this level. The Polish player's coaching setup remains stable under Tomasz Wiktorowski, whilst Bejlek's preparation will have been compressed through qualifying rounds. Swiatek's record against unseeded opponents at Roland Garros stands at 27 wins across her three titles, with first-round exits rare in her career trajectory.

Traders should monitor official draw confirmation and any late withdrawals through the settlement window closing 3 June 2026. Weather delays at Roland Garros occasionally push matches beyond the initial schedule; the seven-day buffer in the resolution criteria accounts for this. Injury updates on either player in the 48 hours before play would be the primary catalyst affecting the current odds, though Swiatek's status as defending champion typically means robust pre-tournament medical clearance.

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 Sport Prediction, which mirrors the Polymarket order book directly.

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

Where can I trade this market with the lowest fees?

On Sport Prediction, 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 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.

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.