Swedish Open: Jesper de Jong vs Sebastian Baez

Platform comparison

Market context

Jesper de Jong faces Sebastian Baez in the Round of 16 at the Nordea Open in Båstad on outdoor clay, with the match scheduled to begin at 14:30 local time. While the prediction market currently implies a 0% chance for de Jong to advance, this stands in stark contrast to sportsbook lines and analyst models that view the Dutchman as the slight favourite.

Historical divergence in tennis markets often signals a mispricing rather than a genuine consensus on player form. Multiple predictive models, including Dimers and Tennis.com, assign de Jong a 51–52% win probability, while Australian bookmaker TAB lists both players at even money ($1.90) [5][7][8]. This 50% analyst consensus against a 0% market implied probability mirrors past instances where prediction markets failed to adjust quickly to late form updates, creating a significant arbitrage opportunity for cross-platform traders.

Traders should monitor the official start time and any pre-match withdrawal announcements, as a walkover would force the market to resolve at 50-50 regardless of the odds divergence [9]. With the match set for outdoor clay in Båstad, surface suitability remains the primary catalyst, though current data suggests de Jong’s recent record of 27–14 offers a stronger statistical foundation than Baez’s 13–10 [6]. The settlement window extends until late July 2026, allowing time for the market to correct if the live action aligns with the 51% modelled probability [5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Swedish Open: Jesper de Jong vs Sebastian Baez 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

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 Best Prediction Markets 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.

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 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.