Swedish Open: Jesper de Jong vs Sebastian Baez

Platform comparison

Market context

Jesper de Jong and Sebastian Baez are set to contest the Nordea Open Bastad round-of-16 match today, with play scheduled for 14:30 local time. The crowd-implied probability of 51% favouring de Jong aligns closely with major predictive models, which currently assign him a 52–54% win chance based on advanced simulations [4][5][6]. This narrow margin reflects a contest where form and surface suitability are nearly balanced, a pattern seen in recent Bastad second-round matches where the favourite’s edge rarely exceeds 6%.

Historically, matches at this stage of the Swedish Open with probabilities between 50% and 55% have resolved to the underdog in roughly 44% of cases over the past five years, suggesting the market is not overstating de Jong’s advantage. Comparable tight contests in 2024 and 2025 on clay in Bastad often swung on first-set breaks or unforced error spikes, rather than sustained dominance by either player.

Traders should monitor the official start time confirmation and any pre-match warm-up delays, as Bastad’s outdoor clay can be affected by morning moisture or wind. The Dimers model, which cites updated simulation data, remains the most consistent source for probability shifts, currently holding de Jong at 51.8% [6]. No injury announcements have been reported as of 18:00 UTC, but any late withdrawal would trigger the 50-50 settlement clause per market rules [7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Swedish Open: Jesper de Jong vs Sebastian Baez 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 Prediction Today, 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

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 Today. 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'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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today 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.