Peter Heller defeated J. Kupcic 6-4 6-7 6-2 in the M15 Litija 1 round of 16 on clay. The upset overturned the form book — J. Kupcic came in leading the head-to-head 1–0, but Peter Heller had been the form player, winning 4 of their last 9 on clay. Peter Heller claimed a first win over J. Kupcic in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-10-04 | M15 Bad Waltersdorf 1 | R32 | clay | J. Kupcic | 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.