Live prediction market odds for Joao Fonseca vs. Casper Ruud. Compare prices across Kalshi and Polymarket.
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Kalshi / Polymarket
2026-05-31
Joao Fonseca vs. Casper Ruud — ATP Tennis match scheduled for 2026-05-31. Compare live prediction market odds from Kalshi, Polymarket, and more on Prediction Hunt.
Casper Ruud leads the “Joao Fonseca vs. Casper Ruud” event at 58.5% implied probability, followed by Joao Fonseca at 42.5%. A 3.0% cross-platform spread signals an active arbitrage window.
Joao Fonseca vs. Casper Ruud is a prediction market event currently tracked across 2 platforms (Kalshi, Polymarket). Casper Ruud leads at 59% implied probability, making it the market favorite. Other contenders include Joao Fonseca at 43%.
Casper Ruud currently leads at 59% implied probability. Behind Casper Ruud, Joao Fonseca at 43% are the next closest contenders. A 3.0% spread across platforms indicated moderate disagreement on the latest developments.
Here are the latest odds across Kalshi, Polymarket: Casper Ruud: 58¢ on Kalshi, 59¢ on Polymarket. Joao Fonseca: 44¢ on Kalshi, 41¢ on Polymarket. The 3.0% spread shows moderate platform divergence worth monitoring for potential opportunities.
A price of 59¢ means the market estimates a 59% probability that Casper Ruud will be the outcome. Buying one share at 59¢ pays out $1.00 if correct — a 69% return — or $0 if wrong. This is the core mechanic of prediction markets: the price directly reflects the crowd's probability estimate.
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Official settlement criteria, resolution sources, and edge cases across Kalshi and Polymarket.
KalshiIf Casper Ruud wins the Ruud vs Fonseca professional tennis match in the 2026 French Open Men Singles Round Of 16 after a ball has been played, then the market resolves to Yes.
The following market refers to the Ruud vs Fonseca professional tennis match in the 2026 French Open Men Singles Round Of 16 after a ball has been played. If the match does not occur (signaled by a ball being played) due to a player injury, walkover, forfeiture, or any other cancellation (all before the match starts), the market will resolve to a fair price in accordance with the rules. If this match is postponed or delayed, the market will remain open and close after the rescheduled match has finished (within two weeks).
PolymarketThis market refers to the tennis match between Casper Ruud and Joao Fonseca in the Roland Garros ATP, originally scheduled for May 31, 2026 at 5:00AM ET. This market will resolve to 'Casper Ruud' if Casper Ruud advances against Joao Fonseca. This market will resolve to 'Joao Fonseca' if Joao Fonseca advances against Casper Ruud. 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. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the ATP Tour. A consensus of credible reporting may also be used.
Casper Ruud
58.5% avg
