Jannik Sinner withdraws from the US Open with a right knee injury, and the men's board resets overnight. The world No. 1 held favorite status all summer. Now Carlos Alcaraz sits alone at the top of the US Open odds 2026 market, and traders on Kalshi and Polymarket already price the fallout.
The US Open main draw starts Sunday, August 30 at the USTA Billie Jean King National Tennis Center. That leaves a few days to read the US Open odds 2026 board before the first ball.
Kalshi US Open Odds 2026
| Player | Win % |
|---|---|
| Carlos Alcaraz | 31% |
| Alexander Zverev | 20% |
| Novak Djokovic | 10% |
| Ben Shelton | 8% |
| Arthur Fils | 7% |
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Polymarket US Open Odds 2026
| Player | Win % |
|---|---|
| Carlos Alcaraz | 31% |
| Alexander Zverev | 20% |
| Novak Djokovic | 11% |
| Ben Shelton | 7% |
| Arthur Fils | 7% |
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Who Will Win the US Open 2026?
Carlos Alcaraz odds: 31%. The defending champion returns from a four-month wrist injury and skips every hard-court warm-up event. He owns the title and the head-to-head record over most of this field. Nobody watches him play a competitive match since April 15 in Barcelona, though. That gap explains why Carlos Alcaraz odds hover near 31% rather than the 40 percent plus a healthy defending champion commands.
Zverev US Open odds: 20%. With Jannik Sinner off the board, the French Open champion inherits the clearest runway of anyone in the top five. Tommy Paul beat him in Cincinnati, which cools the form line, but he chases a second major, and the market respects the floor he brings to every hard-court event. Zverev US Open odds at 20 percent trail Alcaraz by 11 points, a spread that closes fast if the Spaniard drops an early set.
Novak Djokovic: 10 to 11%. Four US Open titles and a shot at a record 25th Grand Slam keep him live. Age argues the other way.
Ben Shelton: 7 to 8%. New York lifts him and his serve travels on this surface.
Arthur Fils: 7%. Traders price him as the breakout name of the fortnight.
Reading US Open Outright Odds
US Open outright odds on prediction markets read as straight probability. A 31 percent contract costs 31 cents and pays $1. Compare that to sportsbook US Open winner odds, where a +140 price implies roughly 41 percent, and the gap shows up fast.
Two habits pay off here. First, check both boards. Kalshi and Polymarket already disagree on Djokovic and Shelton, and small splits like that hand you the better entry. Second, wait for the bracket. The draw lands Thursday at noon, and US Open tennis odds swing hard once the quarters take shape. A favorable quarter moves a mid-tier tennis contender several points on its own.
One more note on timing. US Open tennis odds on both exchanges trade live through the fortnight, so a contract you buy today stays tradable after every result. That flexibility separates a prediction market from a locked sportsbook future, and it rewards anyone who reads the bracket closely on Thursday afternoon.
Key Dates
- Draw Ceremony: Thursday, August 27, around 12:00 p.m. ET
- First Round: Sunday, August 30
- Men's Final: Sunday, September 13
Get Set Before Sunday
Sinner or Alcaraz has sat out each of the last three majors, so treat this draw as genuinely open rather than a coronation. The men's tennis picture stays unsettled until the bracket drops Thursday.
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