Prostejov: Vitaliy Sachko vs Vit Kopriva

Platform comparison

Active sub-markets

Market context

Vitaliy Sachko, a Ukrainian professional tennis player, faces Czech competitor Vit Kopriva in a men's singles match scheduled for the Prostejov tournament on 4 June 2026. The settlement window closes on 11 June, allowing a seven-day buffer for completion or rescheduling. The current market probability of 100% YES implies near-certainty that Sachko will advance, though this reflects either strong pre-match assessment or limited liquidity rather than genuine certainty in tennis outcomes.

Historical precedent from lower-ranked ATP and Challenger circuit matches shows that pre-tournament favourites at Prostejov—a Czech domestic event—typically carry inflated implied probabilities when one player holds home-nation advantage or superior ranking. Kopriva, competing in his domestic market, may receive structural support from crowd and scheduling factors that conventional ratings underestimate. Past Prostejov editions have seen upsets when Czech players mobilise local advantage, suggesting the 100% reading warrants scrutiny against actual head-to-head records and recent form data.

Traders should monitor official ATP Challenger Tour announcements regarding court assignments and match order, as Prostejov scheduling can shift based on weather or withdrawal cascades. Sachko's recent tournament results and any injury reports in the week preceding 4 June will serve as primary catalysts; similarly, Kopriva's performance in qualifying rounds or warm-up matches immediately beforehand could shift the underlying match dynamics. The regulatory framework for this market depends on trader jurisdiction: UK residents face no specific KYC requirement below £1,500 stake under Gambling Commission guidance, whilst US-based traders remain subject to CFTC oversight of prediction contracts, and German participants should verify compliance with GlüStV provisions on sports wagering.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Tax UK, 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

Where can I trade this market with the lowest fees?

On Polymarket Tax 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.

Is this market available outside the US?

Polymarket Tax UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 Polymarket Tax UK?

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

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.