Swedish Open: Andrey Rublev vs Sebastian Baez

Platform comparison

Market context

Andrey Rublev faces Sebastian Baez in the quarter-final of the Swedish Open at Bastad, with the match scheduled to begin at 8:00 AM ET on 17 July 2026. The prediction market currently implies a 100% probability that Rublev advances, a figure that starkly diverges from sportsbook lines and analyst models which assign him roughly a 59–60% chance of victory [1][5][6]. Traditional bookmakers list Rublev at -178 moneyline odds, equivalent to approximately 64%, while independent simulations from Dimers and Tennis.com project a 59% and 60% win probability respectively, leaving the prediction market’s certainty as an outlier [6][5].

Historical precedents in ATP prediction markets show that implied probabilities exceeding 90% for individual matches often correct sharply once live play begins, particularly when surface advantages or fatigue factors are not fully priced into the contract. In comparable Swedish Open quarter-finals, players ranked outside the top 10 have occasionally overturned heavy favourites on clay, suggesting the 100% line may overstate Rublev’s dominance relative to Baez’s clay-court resilience [1]. Traders should monitor the official start-time confirmation and any pre-match injury reports from the Nordea Open, as delays beyond seven days or cancellations trigger a 50-50 settlement rather than a decisive outcome [3].

Key catalysts include the final court assignment and any weather-related interruptions at Bastad, which could delay the match and alter settlement conditions. Recent highlights from Day 4 show Baez competing in Bastad 2026, confirming his active participation, while Rublev’s recent form includes a hard-fought 7-6 victory against Pellegrino, indicating potential fatigue [8]. The divergence between the 100% market implied probability and the 59–64% consensus from sportsbooks and models represents a significant pricing inefficiency for cross-platform arbitrage.

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 PolyGram, which mirrors the Polymarket order book directly.

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

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.

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 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.