Peter Heller defeated Valentin Guenther 4-6 7-6 6-1 in the M15 Kamen 1 round of 32 on clay. The result followed the form book — Peter Heller came in leading the head-to-head 2–0. Peter Heller extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-22 | M15 Ueberlingen 1 | R16 | clay | Peter Heller | 6-4 6-3 |
| 2017-06-26 | Germany F5 | R32 | clay | Peter Heller | 6-1 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.