Winston-Salem Open: Roman Safiullin vs Hugo Grenier

Platform comparison

Market context

Roman Safiullin and Hugo Grenier were drawn to meet at the Winston-Salem Open on 24 August, and the match has since been listed as a live round-of-64 contest on the ATP event schedule at Wake Forest University. Sportsbook pricing has made Safiullin a clear favourite, with consensus lines around 1.20-1.25 decimal on several books, while one market summary put him at roughly 82% to win; that sits above the crowd-implied 73% on this contract, which leaves a modest gap between the betting market and the prediction market.

That gap is consistent with how shorter-priced ATP match-ups can behave when one player is a sizeable but not overwhelming favourite. Tennis Tonic’s pre-match pick also leaned Safiullin in straight sets, while a separate tennis data page gave him an 84% projected win rate, both pointing in the same direction as the sportsbook view. Grenier’s path typically depends on serving well enough to extend sets, but the market is pricing a fairly ordinary underdog upset rather than a near coin-flip.

The main catalysts now are administrative rather than analytical: whether the match is completed, whether it is officially carried over, and whether the tournament’s daily order of play keeps the fixture on court before the event finishes on 29 August. The Winston-Salem Open has publicly listed its schedule as tentative and subject to change, which matters in late-August ATP events where rain, backlog or retirements can push a match into the settlement window. If no winner is determined by 7 September, the contract resolves 50-50 regardless of the pre-match edge.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Winston-Salem Open: Roman Safiullin vs Hugo Grenier across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

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

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.

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?

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