Viacheslav Ovchinnikov defeated L. Aregger 6-3 6-4 in the M15 Monastir 11 q64 on hard. The upset overturned the form book — L. Aregger came in leading the head-to-head 1–0, but Viacheslav Ovchinnikov had been the form player, winning 4 of their last 8 on hard. Viacheslav Ovchinnikov claimed a first win over L. Aregger in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-22 | M15 Kayseri 8 | Q32 | hard | L. Aregger | 3-6 6-4 10-7 |