Daniel Altmaier vs Frances Tiafoe — Halle Semi-final
Altmaier D.
Daniel Altmaier faces Frances Tiafoe in the Halle semi-final on grass. Frances Tiafoe holds the paper edge — ranked #26, leading the head-to-head 4–0, a roughly 190-point grass Elo advantage. Recent grass form is closely matched.
Win Probability
Pre-match · updated 23:21 UTC50–58%
58–67%
67–80%
80%+
Strong favourite · Tiafoe F. heavily favoured
Calibrated model · 65% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.
Key context
- Freshness: Workload contrast: Daniel Altmaier 85 games in 14 days, Frances Tiafoe 119.
- Last match: Frances Tiafoe dropped the opening set before beating Felix Auger Aliassime 3–6 6–3 7–6.
- Head-to-head: Frances Tiafoe leads the head-to-head 4–0, 0–1 on grass. Last met at Stuttgart 2026.
Umpiry 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.
Form trajectory
Direction of recent form — results vs Elo expectation blended with serve/return vs each player's baseline, over the last few months. About
Statistics
This seasonAverages over each player's completed matches in the selected window (22 vs 25). 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 loadAltmaier D.: 2 days rest · 2 matches, 52 games (7d) · Tiafoe F.: 2 days rest · 3 matches, 66 games (7d). Higher means fresher. About
Conditions
Head to head
0–4| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2026-06-09 | Stuttgart | R32 | grass | Frances Tiafoe | 6.3-7.7 6-4 4-6 |
| 2025-05-26 | Roland Garros | R16 | clay | Frances Tiafoe | 6-3 6-4 7-6(4) |
| 2023-05-08 | Rome Masters | R64 | clay | Frances Tiafoe | 3-6 7-5 6-3 |
| 2023-01-16 | Australian Open | R128 | hard | Frances Tiafoe | 6-3 6-3 6-7(5) 7-6(6) |