Quentin Halys vs Facundo Diaz Acosta — US Open Round of 128
Halys Q.
Quentin Halys faces Facundo Diaz Acosta in the US Open round of 128 on hard. Quentin Halys is the paper favourite — ranked #52, defending last year's round of 128, a roughly 140-point hard Elo advantage — but Facundo Diaz Acosta has won their only previous meeting.
Win Probability
Pre-match · updated 12:50 UTC50–58%
58–67%
67–80%
80%+
Clear favourite · Halys Q. clearly ahead, but no certainty
Calibrated model · 65% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.
Key context
- Under pressure: Quentin Halys has the edge on pressure points (Clutch Rating 48 vs Facundo Diaz Acosta's 5).
- Win streak: Facundo Diaz Acosta arrives on a 5-match winning run.
- Head-to-head: Facundo Diaz Acosta leads the head-to-head 1–0. Last met at Winston-Salem 2023.
Common opponents
Last 12 monthsUmpiry Score
Pre-matchThe Umpiry Score combines match-context factors — matchup, form, fatigue, travel and motivation — into a single 0–10 score, updated daily. Read how it works.
Statistics
This seasonAverages over each player's completed matches in the selected window (45 vs 37). ATP, WTA & Challenger.
Serve vs return
This seasonEach player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Clutch
Under pressurePerformance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Freshness
Recent loadHalys Q.: 4 days rest · 1 match, 30 games (7d). Higher means fresher. About
Conditions
Head to head
0–1| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-08-21 | Winston-Salem | R64 | hard | Facundo Diaz Acosta | 4-6 6-2 6-4 |