Wimbledon ATP: Jan-Lennard Struff vs Sebastian Baez

Platform comparison

Market context

Jan-Lennard Struff faces Sebastian Baez in the first round of the 2026 Wimbledon Men’s Singles, with the match scheduled to begin at 10:00am ET on Monday, 29 June. The prediction market currently implies a 100% probability that Struff will advance, a figure that starkly diverges from traditional sportsbook lines and analyst consensus. Major bookmakers like Dimers assign Struff a 72.7% win probability, pricing him at -260 odds, while Baez sits at +230, reflecting a 27.3% chance of victory [1]. This 27% gap between the prediction market’s certainty and the sportsbook’s measured uncertainty represents a meaningful arbitrage signal for traders comparing cross-platform odds.

Historically, such 100% implied probabilities in tennis prediction markets have rarely held when head-to-head records or surface-specific weaknesses exist. Struff and Baez have met once previously, with Struff winning 1-0 on grass, but Baez’s documented struggles on grass courts remain a critical variable [3][10]. Traders should monitor real-time updates from Tennis.com and Flashscore for any weather delays or injury announcements before the match concludes, as these could trigger the market’s 50-50 cancellation clause [9]. With the settlement window ending on 6 July 2026, any delay beyond seven days without a winner would nullify the current certainty, making live form and external conditions the primary catalysts for price movement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

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

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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.