Swedish Open: Jesper de Jong vs Vilius Gaubas

Platform comparison

Market context

Jesper de Jong faces Vilius Gaubas in the opening round of the ATP Nordea Open at Båstad, a clay-court tournament where de Jong has previously demonstrated strong form. The match is scheduled for 13 July 2026, with the prediction market currently pricing de Jong’s advancement at 65% YES. This implied probability sits slightly below the consensus from major sportsbooks and analytical models, which collectively favour the Dutchman more heavily.

Historical data from comparable ATP 250 clay events shows that when prediction markets diverge by more than three percentage points from sportsbook lines, the market often corrects within 24 hours of the match start. In this case, Dimers’ model assigns de Jong a 68.8% win probability, while Tennis.com projects 67%, both exceeding the 65% crowd-implied figure. Such a gap suggests either a temporary liquidity imbalance on the prediction platform or a cautious trader sentiment not reflected in traditional betting markets.

Traders should monitor the official start time confirmation and any pre-match injury updates, as clay-court matches are sensitive to player fitness and weather delays. FanDuel lists the moneyline at –200 for de Jong, reinforcing his status as the clear favourite, while Yahoo Sports confirms the venue as Båstad Tennis Stadium with no reported schedule changes. With the settlement window closing on 20 July 2026, the contract remains open to late adjustments if de Jong’s form or Gaubas’ readiness shifts before play begins.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 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.

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.

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.