

Lukas Klein defeated Quentin Halys 6-4 7-6 in the Brisbane qualifying round 1 on hard. The upset overturned the form book — Quentin Halys came in ranked #57. Lukas Klein extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-07-15 | Gstaad | R16 | clay | Quentin Halys | 6-3 6-7 6-4 |
| 2023-12-30 | Brisbane | Q32 | hard | Lukas Klein | 6-4 7-6(1) |
Averages over each player's completed matches in the selected window (109 vs 163). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About