If Tatiana Prozorova wins the Prozorova vs Costoulas professional tennis match in the 2026 WTA Singapore Round Of 32 after a ball has been played, then the market resolves to Yes.

Edge Cases

The following market refers to the Prozorova vs Costoulas professional tennis match in the 2026 WTA Singapore Round Of 32 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

Tatiana Prozorova in Sofia Costoulas @ Tatiana Prozorova Round of 32 (WTA); settled by Novig.

Edge Cases

If the contract cannot be settled on the stated outcome, Novig settles it at fair market value (FMV) instead of refunding it.

Polymarket

Primary Rule

This market refers to the tennis match between Tatiana Prozorova and Sofia Costoulas in the Singapore Open, originally scheduled for September 20, 2026 at 10:00PM ET. This market will resolve to 'Tatiana Prozorova' if Tatiana Prozorova advances against Sofia Costoulas. This market will resolve to 'Sofia Costoulas' if Sofia Costoulas advances against Tatiana Prozorova. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by October 4, 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 Tatiana Prozorova vs Sofia Costoulas WTA match scheduled for September 21 at 10:00PM. 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 WTA.

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 Sofia Costoulas vs. Tatiana Prozorova prediction market track?

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

What are the latest Sofia Costoulas vs. Tatiana Prozorova odds?

The latest available prices are Tatiana Prozorova: 55.5¢ on Kalshi, 65.0¢ on Polymarket, 59.2¢ on ProphetX, 61.0¢ on Polymarket US, 59.5¢ on Novig; Sofia Costoulas: 44.5¢ on Kalshi, 45.0¢ on Polymarket, 43.2¢ on ProphetX, 39.0¢ on Polymarket US, 43.0¢ on Novig. Prices are quoted in cents per $1 share. Check the venue for executable prices and available liquidity.

Why do Sofia Costoulas vs. Tatiana Prozorova odds vary across prediction markets?

The largest price difference shown across venues is 9.5 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 Sofia Costoulas vs. Tatiana Prozorova prediction market payouts work?

For example, Tatiana Prozorova at 60.0¢ implies about a 60.0% 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.

Sofia Costoulas vs. Tatiana Prozorova

Sofia Costoulas vs. Tatiana Prozorova

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Price History

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Resolution Oracles

Frequently Asked Questions

Sofia Costoulas vs. Tatiana Prozorova

Sofia Costoulas vs. Tatiana Prozorova

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About This Market

Price History

Live Markets

Moneyline

Smart Trade Router

Resolution Oracles

Market Rulebook: Sofia Costoulas vs. Tatiana Prozorova

Frequently Asked Questions