Mateusz Terczynski defeated Juliusz Bienkiewicz 6-1 2-6 6-4 in the M25 Poznan 1 round of 32 on clay. The upset overturned the form book — Juliusz Bienkiewicz came in leading the head-to-head 1–0. Mateusz Terczynski claimed a first win over Juliusz Bienkiewicz in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-08-21 | M25 Poznan 1 | Q32 | clay | Juliusz Bienkiewicz | 3-6 6-3 10-5 |