Peter Heller defeated Valentin Guenther 6-4 6-3 in the M15 Ueberlingen 1 round of 16 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 |
|---|---|---|---|---|---|
| 2019-06-26 | M15 Kamen 1 | R32 | clay | Peter Heller | 4-6 7-6(4) 6-1 |
| 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.