Marsel Ilhan defeated Peter Heller 6-4 7-5 in the Turkey F12 qualifying round on clay. The upset overturned the form book — Peter Heller came in leading the head-to-head 1–0, but Marsel Ilhan had been the form player, winning 6 of their last 9 on clay. Marsel Ilhan claimed a first win over Peter Heller in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-04-19 | M15 Antalya 12 | R32 | clay | Peter Heller | 7-5 6-1 |
Averages over each player's completed matches in the selected window (200 vs 200). 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