Stuttgart Open: Jan-Lennard Struff vs Alexander Bublik

Platform comparison

Active sub-markets

Market context

The Stuttgart Open grass-court tournament will host a first-round match between German qualifier Jan-Lennard Struff and Kazakhstani player Alexander Bublik on 10 June 2026. Polymarket currently prices this contract at 0% YES, reflecting either extreme confidence in Bublik's victory or minimal liquidity in the conditional token pair on Polygon. The settlement window extends to 17 June, allowing a seven-day buffer for scheduling delays before the market resolves to 50-50 if no winner emerges.

Struff and Bublik occupy similar rankings territory on the ATP tour, with head-to-head records offering limited predictive value given the grass-court surface heavily favours serve-dominant players. Bublik's erratic but powerful game has produced occasional upsets on faster courts, whilst Struff's consistency on German soil provides home-court context. Historical precedent suggests first-round grass matches between players of comparable ranking rarely settle at extreme probabilities; the 0% YES reading likely reflects either a data feed error or negligible USDC depth in this particular market pair rather than genuine analytical consensus.

Traders should monitor the ATP's official draw confirmation and any injury announcements in the week preceding the match. Stuttgart's scheduling occasionally compresses due to weather, and grass courts are weather-sensitive. Recent ATP communications regarding the 2026 grass season remain sparse, but the tournament typically adheres to its published calendar. Any withdrawal by either player would trigger the 50-50 resolution clause, fundamentally altering the contract's value regardless of current pricing.

Methodology

We track Stuttgart Open: Jan-Lennard Struff vs Alexander Bublik on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Kalshi UK, which mirrors the Polymarket order book at 0% fees. 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.

What does it cost to trade on Kalshi UK?

Zero. Kalshi UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in minutes.