Jan Jermar defeated Stepan Pecak 6-7 6-3 10-8 in the M25 Quinta Do Lago 1 q64 on hard. The upset overturned the form book — Stepan Pecak came in leading the head-to-head 1–0. Jan Jermar claimed a first win over Stepan Pecak in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-08-30 | M25 Sion 1 | R32 | clay | Stepan Pecak | 5-7 7-6(5) 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.