Resolution criteria on PolyGram: This market refers to the doubles tennis match between Grevelius/Heinonen and Dodig/Mikrut in the Heilbronn, originally scheduled for June 4, 2026 at 6:00AM ET. This market will resolve to 'Grevelius/Heinonen' if the team of Grevelius/Heinonen advances against Dodig/Mikrut. This market will resolve to 'Dodig/Mikrut' if the team of Dodig/Mikrut advances against Grevelius/Heinonen. 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.
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
| Heilbronn (Doubles): Grevelius/Heinonen vs Dodig/Mikrut | 77% YES | 24% NO |
| Completed Match | 50% YES | 50% NO |
The Heilbronn doubles tournament will feature a match between Swedish pairing Grevelius/Heinonen and the Croatian-Polish combination of Dodig/Mikrut, originally scheduled for 4 June 2026. The current order book on Polymarket reflects a 77% implied probability favouring the Swedish pair's advancement, suggesting market participants view them as clear favourites in this encounter.
Dodig brings substantial pedigree to doubles competition, having reached multiple Grand Slam finals and maintained a top-20 ranking in the discipline throughout his career. Mikrut, whilst less decorated, has competed consistently on the ATP Doubles circuit. Grevelius and Heinonen represent a less established pairing by comparison, though both players have shown competitive capacity at Challenger level. The probability spread reflects this experience differential, though doubles outcomes remain notoriously volatile given the format's dependency on serve-and-volley execution and net play precision.
Traders should monitor official ATP tournament updates regarding player fitness and withdrawal announcements in the week preceding the scheduled date. The settlement window extends to 11 June, providing a seven-day buffer for delayed matches. Any late withdrawals or schedule disruptions would trigger the 50-50 resolution clause. Current market pricing suggests confidence in the match proceeding as scheduled, with the probability primarily reflecting perceived on-court capability rather than fixture uncertainty.
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 "Heilbronn (Doubles): Grevelius/Heinonen vs Dodig/Mikrut" are the same as any other PolyGram sporting 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 $27 of resting liquidity puts this market in the below the median by volume for sports 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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