Resolution criteria on PolyGram: This market refers to the doubles tennis match between Gibson/Tjen and Sawangkaew/Tang in the Birmingham, originally scheduled for June 2, 2026 at 5:30AM ET. This market will resolve to 'Gibson/Tjen' if the team of Gibson/Tjen advances against Sawangkaew/Tang. This market will resolve to 'Sawangkaew/Tang' if the team of Sawangkaew/Tang 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
| Completed Match | 50% YES | 50% NO |
| Birmingham (Doubles): Gibson/Tjen vs Sawangkaew/Tang | 76% YES | 24% NO |
Gibson and Tjen face Sawangkaew and Tang in a doubles match at Birmingham, scheduled for 2 June 2026. The 50% implied probability on Polymarket's order book reflects genuine uncertainty between two competitive pairings, with neither team commanding clear favourite status at current market depth. Settlement occurs by 9 June 2026, allowing a seven-day window for completion.
Doubles pairings at grass-court events like Birmingham often feature players stepping up from lower-ranked singles careers or specialist doubles practitioners. Historical context matters here: Gibson and Tjen's recent form against comparable opposition, combined with Sawangkaew and Tang's performance trajectory through 2025 and early 2026, will determine whether the current 50-50 split holds. Grass surfaces reward serve-and-volley specialists and first-serve dominance, factors that shift matchup dynamics compared to hard-court tournaments. Recent ATP and WTA doubles rankings, published monthly, provide the most reliable baseline for assessing relative strength.
Traders should monitor official tournament draw confirmations and any late withdrawals, which remain common in doubles events where players prioritise singles competition. Injury announcements or ranking changes affecting either pairing could shift the order book significantly in the days before play. Weather delays at Birmingham in early June are possible but historically infrequent. The early morning scheduling (5:30 AM ET) may influence betting patterns as European markets open, potentially creating liquidity shifts around that window.
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 Sawangkaew/Tang" 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.
$4 in lifetime turnover and $32 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 9 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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