Swedish Open: Jesper de Jong vs Sebastian Baez

Platform comparison

Market context

The underlying event is the second-round ATP tennis match at the Swedish Open in Båstad, where Jesper de Jong faces Sebastian Baez. In prediction markets, a YES share pays out if de Jong wins the match and advances, while a NO share pays out if Baez advances. The current crowd-implied probability of 51% for YES suggests the market views de Jong as a slight favourite, though the margin is narrow enough to reflect genuine uncertainty.

Historical data from modelling platforms shows similar tight splits in this matchup. Dimers’ advanced tennis model currently assigns de Jong a 54% win probability, while Tennis.com projects a 52% chance for Baez, indicating analysts are nearly divided [2][3]. This mirrors the crowd’s 51% stance, where small shifts in player form or surface preference could flip the outcome. In past ATP events on clay, matches with initial probabilities between 48% and 54% have resolved unpredictably, often depending on first-set momentum rather than pre-match rankings.

Traders should monitor the first-set completion, as unresolved first sets trigger a 50-50 settlement per market rules [6]. Key catalysts include any pre-match injury announcements, weather delays affecting the 4:00 AM ET start, and whether either player has played consecutive matches on clay recently. Betting odds currently list de Jong at -118 and Baez at +106, reinforcing the slight edge for the Dutch player [5]. No major news updates have emerged as of today, but the match is scheduled to begin shortly, making real-time form the primary driver of outcome.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Market 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 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.