Kim Tiilikainen defeated Timothy Aerts 6-1 4-6 6-3 in the Croatia 1 3 qualifying round on clay. The upset overturned the form book — Timothy Aerts came in leading the head-to-head 1–0. Kim Tiilikainen claimed a first win over Timothy Aerts in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-01-31 | Portugal 1 Masters 3 | R16 | clay | Timothy Aerts | 3-6 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.