Domagoj Biljesko defeated Tim Heger 7-5 6-4 in the M25 Maribor 1 q16 on clay. The upset overturned the form book — Tim Heger came in leading the head-to-head 1–0. Domagoj Biljesko claimed a first win over Tim Heger in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-26 | M25 Kiseljak 1 | R32 | clay | Tim Heger | 7-6(6) 2-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.