Ladislav Simon defeated Igor Zelenay 4-6 6-2 6-1 in the Croatia 1 1 qualifying round on clay. The upset overturned the form book — Igor Zelenay came in leading the head-to-head 1–0, but Ladislav Simon had been the form player, winning 3 of their last 6 on clay. Ladislav Simon claimed a first win over Igor Zelenay in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-07-09 | Slovak Rep F5 | R16 | clay | Igor Zelenay | 6-1 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.