Swiss Open: Jerome Kym vs Stefanos Tsitsipas

Platform comparison

Market context

Stefanos Tsitsipas faces Swiss qualifier Jerome Kym in the second round of the ATP Gstaad tournament, with the Greek star widely expected to advance. The match, scheduled for 4:00 AM ET on 15 July 2026, has attracted significant betting interest, with Tsitsipas favoured across major sportsbooks and predictive models.

Historical data and current analytics strongly support Tsitsipas as the clear favourite. Sportsbook moneylines place him at -275 to -248, translating to implied win probabilities between 68% and 72% [1][5][6]. Predictive models from Tennis.com, Stats Insider, and Dimers all project Tsitsipas with a 69–72% chance of victory, often forecasting a straight-sets win [2][5][6]. In contrast, the prediction market’s 36% implied probability for Kym represents a notable divergence, suggesting either a mispricing or a contrarian view not reflected in traditional odds or analyst consensus.

Traders should monitor pre-match announcements regarding player fitness and any schedule shifts, as Kym entered as a wildcard and may face fatigue or adaptation issues on clay. Recent previews confirm Tsitsipas is the pick to win in two sets, with initial odds at 1.43 versus Kym’s 2.81 [4]. No major injury reports have surfaced as of 15 July, but any late updates could shift the market significantly, especially given the current gap between sportsbook lines and prediction-market pricing.

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

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

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.