Milan Welte defeated Constantin Frantzen 3-6 7-5 6-1 in the M25 Marburg 1 round of 16 on clay. The upset overturned the form book — Constantin Frantzen came in leading the head-to-head 1–0. Milan Welte claimed a first win over Constantin Frantzen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2022-07-05 | M25 Marburg 1 | Q16 | clay | Constantin Frantzen | 6-4 3-6 10-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.