If Valentin Royer wins the Royer vs Tsitsipas professional tennis match in the 2026 ATP Cincinnati Round Of 128 after a ball has been played, then the market resolves to Yes.

Edge Cases

The following market refers to the Royer vs Tsitsipas professional tennis match in the 2026 ATP Cincinnati Round Of 128 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). Kalshi is not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Governing League. All trademarks, logos, and brand names are the property of their respective owners.

Resolution Oracles

Kalshi Rules

Polymarket

Primary Rule

This market refers to the tennis match between Valentin Royer and Stefanos Tsitsipas in the Cincinnati Open, originally scheduled for August 13, 2026 at 10:00AM ET. This market will resolve to 'Valentin Royer' if Valentin Royer advances against Stefanos Tsitsipas. This market will resolve to 'Stefanos Tsitsipas' if Stefanos Tsitsipas advances against Valentin Royer. 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.

Resolution Oracles

UMA Optimistic OracleConsensus of Sources

Polymarket US

Primary Rule

This market will settle to the winner of the Valentin Royer vs Stefanos Tsitsipas ATP match scheduled for August 13 at 11:00AM. If the match does not begin due to a walkover, forfeit, injury, or any other cancellation prior to the first point being played, the market will settle to fair market price. If a player retires during the match, the opponent will be recorded as the winner. Outcome sourced from ATP.

ProphetX

Primary Rule

Sports moneyline - resolves based on official game outcome per ProphetX Prediction Rules

Resolution Oracles

ProphetX Rules

Frequently Asked Questions

What does the Stefanos Tsitsipas vs. Valentin Royer prediction market track?

The outcomes listed above show how traders are pricing this question. Compare outcome prices from Kalshi, Polymarket US, Polymarket, ProphetX in one place. Each price reflects the market’s implied probability, not a guaranteed result.

What are the latest Stefanos Tsitsipas vs. Valentin Royer odds?

The latest available prices are Stefanos Tsitsipas: 78.0¢ on Kalshi, 76.0¢ on Polymarket, 77.4¢ on ProphetX, 76.0¢ on Polymarket US; Valentin Royer: 24.0¢ on Kalshi, 24.0¢ on Polymarket, 24.5¢ on ProphetX, 24.0¢ on Polymarket US. Prices are quoted in cents per $1 share. Check the venue for executable prices and available liquidity.

Why do Stefanos Tsitsipas vs. Valentin Royer odds vary across prediction markets?

The largest price difference shown across venues is 2.0 percentage points. Venues have different traders, liquidity and fees, so their prices can differ. A price gap alone does not establish an executable arbitrage opportunity; compare settlement rules and the actual buy and sell prices.

How do Stefanos Tsitsipas vs. Valentin Royer prediction market payouts work?

For example, Stefanos Tsitsipas at 76.8¢ implies about a 76.8% chance. For a standard $1 contract, a share pays $1 if its outcome settles as correct and $0 if it settles as incorrect. A winning share bought at 40¢ earns 60¢ before fees. Check each venue’s settlement rules, fees and eligibility before trading.

Stefanos Tsitsipas vs. Valentin Royer

Stefanos Tsitsipas vs. Valentin Royer

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Stefanos Tsitsipas vs. Valentin Royer

Stefanos Tsitsipas vs. Valentin Royer

Related Markets

Northern Arizona Lumberjacks vs. Idaho State Bengals

Nexus vs. Bushido Wildcats

East Tennessee State Buccaneers vs. The Citadel Bulldogs

San Diego State Aztecs vs. Oregon State Beavers

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Northern Arizona Lumberjacks vs. Idaho State Bengals

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About This Market

Price History

Live Markets

Moneyline

Smart Trade Router

Resolution Oracles

Market Rulebook: Stefanos Tsitsipas vs. Valentin Royer

Frequently Asked Questions