Trade the outcome below — no house edge, instant USDC settlement on Polygon
Resolution criteria on PolyGram: This market refers to the tennis match between Marta Kostyuk and Iga Swiatek in the Roland Garros WTA, originally scheduled for May 31, 2026 at 5:00AM ET. This market will resolve to 'Marta Kostyuk' if Marta Kostyuk advances against Iga Swiatek. This market will resolve to 'Iga Swiatek' if Iga Swiatek advances against Marta Kostyuk. 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.
Real-money prediction markets aggregate live odds from thousands of traders, surfacing a sharper probability than any single forecast. Odds will populate live once the order book fills with 7 days to resolution, well inside the window where catalysts move price most, backed by $332K of resting liquidity.
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
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek | 100% YES | 0% NO |
| Completed Match | 100% YES | 0% NO |
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek Set 1 O/U 8.5 | 100% YES | 0% NO |
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek Match O/U 21.5 | 0% YES | 100% NO |
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek Set 1 Winner | 100% YES | 0% NO |
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek Total Sets: O/U 2.5 | 0% YES | 100% NO |
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek Set Handicap +/-1.5 | 0% YES | 100% NO |
| Roland Garros WTA: Marta Kostyuk vs Iga Swiatek Set 1 O/U 9.5 | 100% YES | 0% NO |
Marta Kostyuk will face Iga Swiatek in the women's singles draw at Roland Garros in May 2026. The current order book on Polymarket prices Kostyuk's advancement at 30 per cent implied probability, reflecting the substantial gap in recent form and head-to-head record between the two players. Swiatek, a three-time Grand Slam champion with two Roland Garros titles, remains the clear favourite despite inconsistent results in 2025 and early 2026.
Kostyuk has never defeated Swiatek in their professional meetings, with the Polish player winning all four completed encounters. Their most recent match occurred at the 2024 Australian Open, where Swiatek prevailed in straight sets. Kostyuk's ranking has fluctuated between 15th and 25th globally, whilst Swiatek typically operates in the top five. The 30 per cent probability assigned to Kostyuk reflects her underdog status rather than any recent shift in the competitive dynamic between them.
Traders should monitor Swiatek's fitness status and tournament draw positioning in the weeks preceding Roland Garros, particularly given her history of injury-related withdrawals. Any changes to seeding or bracket placement could alter match-up timing and surface conditions. Kostyuk's performance at warm-up events on clay in May will provide concrete evidence of her form heading into the tournament. The settlement window closes 7 June 2026, allowing for potential delays or weather interruptions typical of the Paris clay-court season.
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.
For this market, the resolution date is 7 June 2026. A UMA proposer can submit the outcome from that moment; the two-hour dispute window closes at , and assuming no counter-claim is staked, winning USDC clears to trader balances by approximately .
If a dispute is filed inside the two-hour window, the outcome escalates to UMA token-holder voting, which extends settlement by roughly 48 hours. Because this market resolves from a publicly verifiable feed (https://www.wtatennis.com/scores), the probability of dispute is materially lower than the overall 0.5% PolyGram baseline — most disputes occur on markets with ambiguous wording or non-public resolution sources.
Withdrawal pace from your PolyGram balance is non-custodial and immediate — once payout clears, funds are yours to send to any Polygon wallet you control. Funds clear directly to your in-app USDC balance on Polygon. Withdrawals are non-custodial: send to any address you control, typical confirmation under 30 seconds, gas paid in USDC if you'd rather not hold MATIC.
Minimum order size on PolyGram is $1.00, with no maximum cap aside from available book depth. Orders route into Polymarket's on-chain CLOB on Polygon; the matching engine pairs YES buyers with NO buyers atomically — every executed trade is settled on-chain with no counterparty risk. For "Roland Garros WTA: Marta Kostyuk vs Iga Swiatek", order-book behaviour for this market reflects the underlying volatility of the outcome — patient limit orders typically fill closer to mid than market orders.
The trade ticket includes a slippage box (default 2%, configurable 0.1%-10%) that caps the worst-case entry price. Your maximum loss is your stake — winning YES (or NO) shares pay $1.00 each at resolution. With this market's current book depth ($332K of resting liquidity), a $500 order should fill with single-cent slippage at the displayed mid-price.
PolyGram charges 0% house edge — no spread mark-up, no rake on winnings, no withdrawal fees beyond network gas. The platform earns exclusively from optional features (copy-trade boosts, advanced order types, the yield vault on idle USDC); the trading surface itself is at-cost.
The mechanics for trading "Roland Garros WTA: Marta Kostyuk vs Iga Swiatek" 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.
$2.4M in lifetime turnover and $332K of resting liquidity puts this market in the top 2% by volume for tennis contracts on PolyGram. Order-book depth is exceptional — among the deepest order books in the category.
Last 24 hours alone saw $2.4M in turnover, well above the lifetime daily-average for this market — a clear sign of news catalysing trader activity right now.
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 7 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. For "Roland Garros WTA: Marta Kostyuk vs Iga Swiatek", the considerations above apply directly — Trade size should reflect the binary nature of the payoff: even a 70% probability event resolves NO 30% of the time, so any single position can lose 100% of staked capital.
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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