Stepan Pecak defeated Jan Jermar 5-7 7-6 6-3 in the M25 Sion 1 round of 32 on clay. The upset overturned the form book — Jan Jermar came in leading the head-to-head 1–0. Stepan Pecak claimed a first win over Jan Jermar in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-10-17 | M25 Quinta Do Lago 1 | Q64 | hard | Jan Jermar | 6-7(6) 6-3 10-8 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.