Resolution criteria on PolyGram: This market refers to the tennis match between Vitaliy Sachko and Vit Kopriva in the Prostejov, originally scheduled for June 4, 2026 at 4:00AM ET. This market will resolve to 'Vitaliy Sachko' if Vitaliy Sachko advances against Vit Kopriva. This market will resolve to 'Vit Kopriva' if Vit Kopriva advances against Vitaliy Sachko. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances.
PolyGram is an on-chain prediction market where you trade YES or NO outcome shares with real USDC on Polygon. For this market, buy YES if you believe the event will happen, or NO if you think it won't. Your maximum loss is your stake — winning shares pay $1.00 each at resolution. Unlike sportsbooks, there is no house edge: prices are set by supply and demand from other traders and reflect the crowd's real-time probability.
Market outcomes
| Prostejov: Vitaliy Sachko vs Vit Kopriva | 22% YES | 78% NO |
| Completed Match | 50% YES | 50% NO |
Vitaliy Sachko and Vit Kopriva are scheduled to meet in the Prostejov tournament on 4 June 2026. The current order book on Polymarket prices Sachko's advancement at 22%, implying Kopriva is favoured at 78%. This pricing reflects the cumulative assessment of traders evaluating both players' form, head-to-head record, and surface suitability ahead of the settlement window closing on 11 June.
Sachko, a Ukrainian player, and Kopriva, a Czech competitor, operate at similar levels of professional tennis—both typically competing in Challenger and lower-tier ATP events. The 22% probability assigned to Sachko suggests the market views Kopriva as the stronger prospect for this particular matchup, likely weighted towards home advantage given Prostejov's location in the Czech Republic and Kopriva's familiarity with regional clay courts. Historical patterns in lower-tier professional tennis show that home-court players often command 60–80% implied probabilities depending on ranking differential and recent results.
Traders should monitor official tournament draws and any late withdrawals or injury announcements from either player in the days preceding 4 June. Weather conditions at Prostejov—particularly rainfall affecting clay court play—could shift match dynamics and trigger postponements. The settlement window extends to 8 June, allowing a seven-day buffer for rescheduling; matches delayed beyond that point without completion resolve to 50-50, creating tail-risk considerations for positions held into the final days.
This market settles from the official outcome published at https://www.atptour.com/en/scores/current. A proposer submits the final result to the UMA optimistic oracle on Polygon; the two-hour dispute window closes and payouts clear in USDC.
The mechanics for trading "Prostejov: Vitaliy Sachko vs Vit Kopriva" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.
$0 in lifetime turnover and $405 of resting liquidity puts this market in the below the median by volume for tennis contracts on PolyGram. Order-book depth is thin — large orders may need to be split across the book or executed as limit orders.
The market has been open for under a month — fresh enough that information asymmetry remains a real factor.
Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.
Resolution is sourced from https://www.atptour.com/en/scores/current. Settlement is executed by the UMA optimistic oracle on Polygon, with a 2-hour dispute window before payouts clear.
This prediction market is scheduled to close on 11 June 2026. After the resolving event occurs, settlement typically clears within 24 hours once the UMA optimistic oracle confirms the outcome. All payouts are in USDC on the Polygon network.
To trade on this prediction market, create a free PolyGram account at polygram.ink, deposit USDC via Polygon, and place a YES or NO order on the outcome you believe in. You can learn more on our how-it-works page. Your maximum loss is limited to your stake — there is no leverage or margin.
When the outcome is determined, winning YES shares pay out $1.00 each in USDC, while losing shares pay $0. Settlement is handled by the UMA optimistic oracle on Polygon — a proposer submits the result, a two-hour dispute window opens, and if uncontested, payouts are distributed automatically. You can withdraw your winnings to any Polygon wallet.
Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.
Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.
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