Resolution criteria on PolyGram: This market refers to the doubles tennis match between Gibson/Tjen and Preston/Swan in the Birmingham, originally scheduled for June 4, 2026 at 10:30AM ET. This market will resolve to 'Gibson/Tjen' if the team of Gibson/Tjen advances against Preston/Swan. This market will resolve to 'Preston/Swan' if the team of Preston/Swan advances against Gibson/Tjen. 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
| Birmingham (Doubles): Gibson/Tjen vs Preston/Swan | 55% YES | 45% NO |
| Completed Match | 50% YES | 50% NO |
Gibson and Tjen face Preston and Swan in a doubles match at Birmingham, with the contest originally scheduled for 4 June 2026 at 10:30 AM ET. The current order book on Polymarket reflects a 50-50 split, indicating genuine uncertainty amongst traders regarding which pairing advances. This even pricing suggests neither team holds a decisive advantage in the market's assessment, with liquidity distributed evenly across both outcomes as of today's snapshot.
Comparable doubles matchups at grass-court events like Birmingham typically hinge on serve-and-volley proficiency and first-serve percentages, where marginal differences in execution prove decisive. Historical data from ATP and WTA doubles draws at similar venues shows that seeding disparities and recent partnership chemistry often correlate with match outcomes more reliably than individual player rankings alone. The current 50-50 probability implies the market views these factors as balanced between the two teams.
Traders should monitor several developments before settlement on 11 June. Confirmation of player fitness and participation remains critical, particularly given the compressed professional calendar around grass-court season. Any withdrawal announcements or late schedule adjustments could trigger sharp repricing. Additionally, head-to-head records between these specific pairings, if available, and recent tournament results from both teams in May and early June will provide concrete data points for position adjustment. Weather conditions at Birmingham on match day may also influence serve-dominant strategies that favour one pairing over the other.
This market settles from the official outcome published at https://www.wtatennis.com/scores. 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 "Birmingham (Doubles): Gibson/Tjen vs Preston/Swan" 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 $199 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.wtatennis.com/scores. 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.
Explore more prediction market odds and trading opportunities on PolyGram: