Market prices an 11.5% chance of “Will Carlos Alcaraz win the 2026 Men's US Open” — up 1 point in 24 hours
Original Polymarket title: “Will Carlos Alcaraz win the 2026 Men's US Open?”
A repricing with partial backing — read the new probability with some caution.
The pricing has partial support: healthy trading volume and market depth, a tight spread.
What this market actually measures
The 2026 U.S. Open tennis tournament is scheduled for August 23 - September 13, 2026.
This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.
View full official resolution rules
The 2026 U.S. Open tennis tournament is scheduled for August 23 - September 13, 2026. This market will resolve to the player that wins the 2026 U.S. Open Men’s Singles Tournament. If at any point it becomes impossible for a listed player to win the 2026 U.S. Open Men’s Singles Tournament per the rules of the tournament, the corresponding market will resolve to “No”. If the 2026 U.S. Open Men’s Singles Tournament is cancelled, postponed after October 31, 2026, or there is otherwise no winner declared within that timeframe, this market will resolve to “Other”. The primary resolution source will be official information from the U.S. Open (https://www.usopen.org/index.html); however, a consensus of credible reporting may also be used.
How credible was the move?
Three separate questions — a move can be genuine while the latest price is still settling. Methodology →
Move validity
Is the move backed by real trading and depth?
The pricing has partial support: healthy trading volume and market depth, a tight spread.
Consensus stability
Has the market settled at the new probability?
Movement has slowed (1 point over six hours) but the market has not fully settled.
Contract clarity
Will the rules resolve without ambiguity?
The resolution rules are relatively specific, with a named source and a defined deadline.
From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.
What could move this market next?
- The scheduled event takes placeSeptember 12, 2026 at 8:00 PM ET
The contract resolves on the event's outcome.
Derived from the contract's own mechanics as of Aug 6, 8:56 AM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.
Advanced analysis (experimental)
Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: low · expected error ±16 pts.
What's happening
Thin book and/or wide spread. Small orders can move this price disproportionately, so any single print is noisy and easily overread.