If Katerina Siniakova wins the Stoiana vs Siniakova professional tennis match in the 2026 WTA Osaka Quarterfinal after a ball has been played, then the market resolves to Yes.

Edge Cases

The following market refers to the Stoiana vs Siniakova professional tennis match in the 2026 WTA Osaka Quarterfinal 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

Novig

Primary Rule

Katerina Siniakova in Katerina Siniakova @ Mary Stoiana Quarterfinals (WTA); settled by Novig.

Polymarket

Primary Rule

This market refers to the tennis match between Mary Stoiana and Katerina Siniakova in the Japan Women's Open, originally scheduled for October 23, 2026 at 1:30AM ET. This market will resolve to 'Mary Stoiana' if Mary Stoiana advances against Katerina Siniakova. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova advances against Mary Stoiana. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 6, 2026, 11:59 PM ET (14 days after the scheduled start), 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 WTA 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 Mary Stoiana vs Katerina Siniakova WTA match scheduled for October 23, 2026 at 12:50AM ET (as of the listing of the event's first instrument). If the match does not begin due to a walkover, withdrawal, or cancellation, the market will settle to the last fair market price. If a player retires or is disqualified during the match, the market will settle to the official winner of the match. If the match is delayed, postponed, suspended or otherwise rescheduled to a date and time not within two days of the originally scheduled date and time, the market will settle to the last fair market price. Outcome sourced from WTA.

Frequently Asked Questions

What does the Katerina Siniakova vs. Mary Stoiana prediction market track?

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

What are the latest Katerina Siniakova vs. Mary Stoiana odds?

The latest available prices are Katerina Siniakova: 71.5¢ on Kalshi, 70.5¢ on Polymarket, 71.5¢ on Polymarket US, 71.5¢ on Novig; Mary Stoiana: 29.5¢ on Kalshi, 29.5¢ on Polymarket, 28.5¢ on Polymarket US, 28.5¢ on Novig. Prices are quoted in cents per $1 share. Check the venue for executable prices and available liquidity.

Why do Katerina Siniakova vs. Mary Stoiana odds vary across prediction markets?

The largest price difference shown across venues is 1.0 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 Katerina Siniakova vs. Mary Stoiana prediction market payouts work?

For example, Katerina Siniakova at 71.3¢ implies about a 71.3% 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.

Katerina Siniakova vs. Mary Stoiana

Katerina Siniakova vs. Mary Stoiana

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Frequently Asked Questions

Katerina Siniakova vs. Mary Stoiana

Katerina Siniakova vs. Mary Stoiana

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About This Market

Price History

Live Markets

Moneyline

Smart Trade Router

Resolution Oracles

Market Rulebook: Katerina Siniakova vs. Mary Stoiana

Frequently Asked Questions