If Heather Watson wins the Watson vs Dart professional tennis match in the 2026 US Open Women Singles Qualification Final after a ball has been played, then the market resolves to Yes.

Edge Cases

The following market refers to the Watson vs Dart professional tennis match in the 2026 US Open Women Singles Qualification Final 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 Heather Watson and Harriet Dart in the US Open, Qualification WTA, originally scheduled for August 27, 2026 at 1:00PM ET. This market will resolve to 'Heather Watson' if Heather Watson advances against Harriet Dart. This market will resolve to 'Harriet Dart' if Harriet Dart advances against Heather Watson. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 10, 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 Heather Watson vs Harriet Dart WTA match scheduled for August 27 at 1:00PM. 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 Harriet Dart vs. Heather Watson 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 Harriet Dart vs. Heather Watson odds?

The latest available prices are Harriet Dart: 63.0¢ on Kalshi, 64.0¢ on Polymarket, 64.2¢ on ProphetX, 63.0¢ on Polymarket US; Heather Watson: 38.0¢ on Kalshi, 36.0¢ on Polymarket, 38.4¢ on ProphetX, 37.0¢ on Polymarket US. Prices are quoted in cents per $1 share. Check the venue for executable prices and available liquidity.

Why do Harriet Dart vs. Heather Watson odds vary across prediction markets?

The largest price difference shown across venues is 2.4 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 Harriet Dart vs. Heather Watson prediction market payouts work?

For example, Harriet Dart at 63.6¢ implies about a 63.6% 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.

Harriet Dart vs. Heather Watson

Harriet Dart vs. Heather Watson

Related Markets

Marvin Vettori vs. Ismail Naurdiev

Louis Tessa vs. Emilien Demanet

North Texas Mean Green vs. Tulsa Golden Hurricane

Michiel De Krom vs. Mario Martinez Serrano

Noelani Sara Teso vs. Marianna Shikhanova

Related Markets

Marvin Vettori vs. Ismail Naurdiev

Louis Tessa vs. Emilien Demanet

North Texas Mean Green vs. Tulsa Golden Hurricane

Michiel De Krom vs. Mario Martinez Serrano

Noelani Sara Teso vs. Marianna Shikhanova

About This Market

Price History

Live Markets

Moneyline

Smart Trade Router

Resolution Oracles

Frequently Asked Questions

Harriet Dart vs. Heather Watson

Harriet Dart vs. Heather Watson

Related Markets

Marvin Vettori vs. Ismail Naurdiev

Louis Tessa vs. Emilien Demanet

North Texas Mean Green vs. Tulsa Golden Hurricane

Michiel De Krom vs. Mario Martinez Serrano

Noelani Sara Teso vs. Marianna Shikhanova

Related Markets

Marvin Vettori vs. Ismail Naurdiev

Louis Tessa vs. Emilien Demanet

North Texas Mean Green vs. Tulsa Golden Hurricane

Michiel De Krom vs. Mario Martinez Serrano

Noelani Sara Teso vs. Marianna Shikhanova

About This Market

Price History

Live Markets

Moneyline

Smart Trade Router

Resolution Oracles

Market Rulebook: Harriet Dart vs. Heather Watson

Frequently Asked Questions