Sports

Men's US Open Winner - 2026

Kalshi vs Polymarket, compared live. Resolves Sep 13, 2026 ·

Prediction market prices reflect trader sentiment, not a guaranteed outcome. Nothing on this page is financial advice or a promise of any return.

Carlos Alcaraz

Kalshi
Chance of Yes60.0%
Bid 59.0% / Ask 60.0%
View on Kalshi
Polymarket
Chance of Yes58.5%
Bid 58.0% / Ask 59.0%
View on Polymarket
Best available price: Polymarket (+1 pts)
Last checked just now · refreshes automatically every 30s
KalshiPolymarket
0%30%60%Jun 16Sep 6
Sep 6, 2026Kalshi50.0%Polymarket59.5%

Alexander Zverev

Kalshi
Chance of Yes23.0%
Bid 23.0% / Ask 24.0%
View on Kalshi
Polymarket
Chance of Yes22.3%
Bid 22.1% / Ask 22.5%
View on Polymarket
Best available price: Polymarket (+1.5 pts)
Last checked just now · refreshes automatically every 30s
KalshiPolymarket
0%20%40%Jun 11Sep 6
Sep 6, 2026Kalshi24.0%Polymarket22.3%

Ben Shelton

Kalshi
Chance of Yes6.0%
Bid 6.0% / Ask 7.0%
View on Kalshi
Polymarket
Chance of Yes5.9%
Bid 5.4% / Ask 6.3%
View on Polymarket
Best available price: Polymarket (+0.7 pts)
Last checked just now · refreshes automatically every 30s
KalshiPolymarket
0%8%15%Jun 12Sep 6
Sep 6, 2026Kalshi8.0%Polymarket5.8%

Taylor Fritz

Kalshi
Chance of Yes1.0%
Bid 0.0% / Ask 100.0%
View on Kalshi
Polymarket
Chance of Yes0.0%
Bid 0.0% / Ask 0.1%
View on Polymarket
Best available price: Polymarket (+99.9 pts)
Last checked just now · refreshes automatically every 30s
KalshiPolymarket
0%10%20%Jun 12Sep 6
Sep 6, 2026Kalshi1.0%Polymarket9.9%

Rafael Jodar

Kalshi
Chance of Yes1.0%
Bid 0.0% / Ask 100.0%
View on Kalshi
Polymarket
Chance of Yes0.0%
Bid 0.0% / Ask 0.1%
View on Polymarket
Best available price: Polymarket (+99.9 pts)
Last checked just now · refreshes automatically every 30s
KalshiPolymarket
0%5%10%Jun 19Sep 3
Sep 3, 2026Kalshi1.0%Polymarket0.1%
  • The competition has seen drama from the first round, firstly in the premature exit of Novak Djokovic after a shock early defeat and secondly in the withdrawal of world No.1 Jannik Sinner with a knee injury.
  • Many believe this has left the door open for Carlos Alcaraz even though a wrist injury has forced him off of the courts for the past five months.
  • Alcaraz put any doubt to bed though after defeating Roman Safiullin 6-4, 6-4, 6-4 in his first game back, with former US Open Champ Andy Roddick even commenting that Alcaraz's forehand speed seemed higher than last year.
  • Alexander Zverev is now the tournament's top remaining seed but remains second to Alcaraz in the odds at around 21%, while Ben Shelton and Taylor Fritz trail behind.
  • The final is scheduled for Sunday, September 13.
  • Alcaraz's straight-sets win over Safiullin has pushed him further clear at 37%, with Zverev now second at 20% after a scare against Lorenzo Sonego.
By Owain Flanders · Updated by hand Sep 2, 2026
  • Resolves Yes for whichever player wins the 2026 US Open Men's Singles title - only the five most-backed contenders are tracked on this page, out of 35+ players still listed on Kalshi and 49+ on Polymarket.
  • Kalshi's own wording (per player): "If [Player] wins the 2026 US Open Men's Singles professional tennis tournament, then the market resolves to Yes." A player who withdraws or is otherwise eliminated from contention resolves No immediately, without waiting for the tournament to finish.
  • Both of the tournament's top seeds are already out and resolved No: Jannik Sinner withdrew before his opening match with a knee injury, and Novak Djokovic lost in the first round to Mariano Navone - the first time he's ever lost that early at the US Open.
  • One real gap between the platforms: Polymarket's cutoff is Sep 13, 2026, while Kalshi's runs a little later, expected around Sep 14, 2026 once the final concludes.
  • 2026-09-11
    Men's semifinals
  • 2026-09-13
    Men's final - Polymarket's resolution cutoff
  • Ongoing
    Any further injury news or withdrawals among the remaining top contenders
  • 2026-09-14
    Kalshi's expected resolution, shortly after the final concludes