Liege: Andres Santamarta vs Gilles Arnaud Bailly

Platform comparison

Market context

The underlying event is a scheduled ATP tennis match in Liege between Andres Santamarta Roig and Gilles Arnaud Bailly, set to begin on 7 July 2026 at 5:00 AM ET. The prediction market currently implies a 0% probability that Santamarta will advance, a stark divergence from the players’ comparable rankings—Santamarta at 210 and Bailly at 174—and the absence of any prior head-to-head wins between them[2][7]. Historical precedents in low-tier ATP events show that such zero-implied probabilities often reflect liquidity gaps rather than genuine match outcomes, especially when no prior rivalry exists and both players have recent competitive form[2][8].

Traders should monitor the official ATP Tour schedule for any delays or cancellations, as unresolved matches default to a 50-50 settlement[1]. Key catalysts include pre-match injury announcements, weather conditions in Liege, and the first-set completion clause, which triggers a 50-50 resolution if the opening set is not finished[1]. Recent coverage from TennisTemple highlights both players’ latest results, with Bailly showing a 75 win in Liege and Santamarta a 64 result, suggesting competitive parity that contradicts the current market pricing[2]. Cross-platform odds comparisons reveal meaningful divergence between sportsbook lines and prediction-market implied probabilities, underscoring the need for careful verification before trading.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Liege: Andres Santamarta vs Gilles Arnaud Bailly across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 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 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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.