Guillem Burniol defeated Jedrzej Zarski 7-6 6-1 in the Poland F4 round of 32 on clay. The upset overturned the form book — Jedrzej Zarski came in leading the head-to-head 1–0. Guillem Burniol claimed a first win over Jedrzej Zarski in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-08-16 | Lithuania F2 | R16 | clay | Jedrzej Zarski | 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.