Domagoj Biljesko defeated Z. Velcz 4-6 6-3 6-4 in the M15 Celje 1 quarter-final on clay. The result followed the form book — Domagoj Biljesko came in leading the head-to-head 1–0. Domagoj Biljesko extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-06-02 | M15 Sarajevo 1 | R32 | clay | Domagoj Biljesko | 6-7(4) 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.