Roland Garros ATP: Adam Walton vs Daniil Medvedev

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Market context

Adam Walton, a British qualifier ranked outside the top 200, faces world number four Daniil Medvedev in the first round of Roland Garros on 24 May 2026. Medvedev has won three of his past four clay-court tournaments and reached the semi-finals at Roland Garros in 2024, though his record on the surface remains weaker than on hard courts. Walton has never competed in a Grand Slam main draw and would need to upset a player who has finished runner-up at two majors.

The 29% probability assigned to Walton reflects the extreme disparity in ranking and experience. Medvedev's recent form on clay has improved markedly—he defeated Jannik Sinner in Madrid last month and has adjusted his serve-and-volley approach to suit slower courts better, according to reports from Tennis Explorer. However, first-round matches at Roland Garros frequently produce upsets when seeded players face qualifiers unfamiliar with the draw's pressure; Medvedev has lost to unranked opponents twice in his career on clay, most recently in 2019.

Traders should monitor Medvedev's fitness status in the week before the match, as he carried a minor shoulder complaint into the Rome Masters. Walton's qualifying run and draw position will clarify whether he arrives with momentum or fatigue. The scheduled 5:00 AM ET start time may also factor into early-round performance, particularly for a qualifier playing his first Grand Slam match. Any withdrawal or scheduling change beyond 7 days from the date triggers a 50-50 resolution.

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

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.

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.