Resolution criteria on PolyGram: This market refers to the tennis match between Courtney John Lock and Iiro Vasa in the Brazzaville, originally scheduled for May 5, 2026 at 12:00PM ET. This market will resolve to 'Courtney John Lock' if Courtney John Lock advances against Iiro Vasa. This market will resolve to 'Iiro Vasa' if Iiro Vasa advances against Courtney John Lock. 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
| Brazzaville: Courtney John Lock vs Iiro Vasa | 0% YES | 100% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Set 1 O/U 8.5 | 0% YES | 100% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Set 1 Winner | 0% YES | 100% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Total Sets: O/U 2.5 | 50% YES | 50% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Match O/U 21.5 | 50% YES | 50% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Set 1 O/U 9.5 | 0% YES | 100% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Match O/U 22.5 | 50% YES | 50% NO |
| Brazzaville: Courtney John Lock vs Iiro Vasa Set 1 O/U 10.5 | 0% YES | 100% NO |
Courtney John Lock and Iiro Vasa are scheduled to meet in a tennis match in Brazzaville on 5 May 2026. The current order book on Polymarket shows zero demand for a Lock victory, with the implied probability sitting at 0% YES. This extreme pricing typically reflects either a structural mismatch in trader interest, limited liquidity in the order book, or a consensus view that Vasa is heavily favoured. The settlement window closes on 12 May 2026 at 16:00 UTC, allowing a seven-day grace period for completion.
Lock, a South African player, and Vasa, a Finnish competitor, operate at different tiers of professional tennis. Lock has competed primarily on the ATP Challenger circuit and lower-ranked events, whilst Vasa has maintained a higher ranking trajectory. Historical precedent suggests that when one player carries a significantly higher seeding or ranking, the market often prices the underdog at minimal probability, particularly when liquidity is thin. The 0% reading here may reflect limited order book depth rather than a definitive assessment of match outcome.
Traders should monitor official ATP or ITF tournament announcements regarding court assignments, weather conditions in Brazzaville, and any last-minute withdrawals or illness declarations. Fixture confirmations typically arrive one to two weeks before play. The settlement terms include a 50-50 resolution if the match is cancelled outright or delayed beyond seven days without completion—a material risk factor for African venue tournaments subject to logistical constraints.
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: Courtney John Lock vs Iiro Vasa" 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.
$10K in lifetime turnover and $0 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 12 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.
Explore more prediction market odds and trading opportunities on PolyGram: