Resolution criteria on PolyGram: This market refers to the tennis match between Karan Singh and Ivan Marrero in the Brazzaville, originally scheduled for May 8, 2026 at 5:00AM ET. This market will resolve to 'Karan Singh' if Karan Singh advances against Ivan Marrero. This market will resolve to 'Ivan Marrero' if Ivan Marrero advances against Karan Singh. 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
| Brazzaville: Karan Singh vs Ivan Marrero | 0% YES | 100% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Set 1 Winner | 0% YES | 100% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Total Sets: O/U 2.5 | 50% YES | 50% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Match O/U 21.5 | 50% YES | 50% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Set 1 O/U 8.5 | 100% YES | 0% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Set 1 O/U 9.5 | 100% YES | 0% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Match O/U 22.5 | 50% YES | 50% NO |
| Brazzaville: Karan Singh vs Ivan Marrero Set 1 O/U 10.5 | 100% YES | 0% NO |
A tennis match between Karan Singh and Ivan Marrero is scheduled for 8 May 2026 in Brazzaville, with settlement occurring by 15 May 2026. The current orderbook on Polymarket shows 0% implied probability for Singh's advancement, reflecting either strong conviction in Marrero's superiority or minimal liquidity at present price levels. This settlement window allows seven days beyond the scheduled date for completion; matches delayed beyond that threshold or cancelled outright resolve to 50-50.
Singh and Marrero operate at different tiers of professional tennis. Singh, an Indian player, has competed primarily on ITF and Challenger circuits with limited ATP exposure, whilst Marrero, a Spanish competitor, has established a more consistent ranking trajectory on the Challenger tour. Historical precedent suggests that when lower-ranked players face higher-ranked opponents in prediction markets, the favourite's probability often reflects genuine rating differentials rather than speculative positioning. The 0% reading here likely reflects Marrero's documented superiority rather than market dysfunction.
Traders should monitor ATP and Challenger tour announcements regarding player withdrawals or injury updates in the weeks preceding 8 May. Weather conditions in Brazzaville during May—including potential rain delays—could trigger the seven-day extension clause. Confirmation of the tournament's scheduling and any late draws adjustments will clarify whether this match proceeds as planned. Early liquidity remains sparse, so significant position accumulation could shift implied probabilities substantially once trading volume increases.
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 "Brazzaville: Karan Singh vs Ivan Marrero" 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.
$46K in lifetime turnover and $0 of resting liquidity puts this market in the above 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 15 May 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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