Resolution criteria on PolyGram: This market refers to the tennis match between Jumpei Yamasaki and Leo Vithoontien in the ITF Men Karuizawa, originally scheduled for May 27, 2026 at 9:00PM ET. This market will resolve to 'Jumpei Yamasaki' if Jumpei Yamasaki advances against Leo Vithoontien. This market will resolve to 'Leo Vithoontien' if Leo Vithoontien advances against Jumpei Yamasaki. 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
| ITF Karuizawa: Jumpei Yamasaki vs Leo Vithoontien | 0% YES | 100% NO |
| Completed Match | 100% YES | 0% NO |
Jumpei Yamasaki faces Leo Vithoontien in the ITF Men's Karuizawa tournament, scheduled for 27 May 2026. The match represents a lower-tier professional tennis fixture on the ITF circuit, where both players compete for ranking points and prize money. The 0% implied probability on Polymarket's order book reflects minimal trading activity rather than certainty of outcome; with thin liquidity typical of niche tennis markets, even modest positions can skew displayed odds significantly away from fundamental expectations.
ITF Karuizawa draws primarily Japanese and regional Asian players, with Yamasaki holding home advantage. Historical context suggests Japanese players competing on home soil in ITF events typically command modest probability premiums, though this varies considerably by individual ranking and recent form. The current zero probability likely indicates no substantive bids exist for a Yamasaki victory at any price point, a common occurrence in low-volume prediction markets where traders have not yet positioned themselves.
Key catalysts include official confirmation of both players' participation closer to the event date, as ITF withdrawals and schedule changes occur regularly. Recent ITF tournament reports and player ranking updates through May 2026 will clarify current form and head-to-head records. Traders should monitor the ATP/WTA ranking trajectories of both competitors and any injury announcements. The settlement window closes 4 June 2026, allowing approximately one week beyond the scheduled match date for completion or resolution under the 50-50 tie-break conditions.
This market settles from the official outcome published at https://www.itftennis.com/en/tournament-calendar/. 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 "ITF Karuizawa: Jumpei Yamasaki vs Leo Vithoontien" 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.
$407 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.itftennis.com/en/tournament-calendar/. 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 4 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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