Marko Tkalec defeated Josip Dumanic 2-6 6-3 6-2 in the Croatia F1 round of 32 on clay. The upset overturned the form book — Josip Dumanic came in leading the head-to-head 1–0, but Marko Tkalec had been the form player, winning 5 of their last 5 on clay. Marko Tkalec claimed a first win over Josip Dumanic in two meetings, levelling the head-to-head at 1–1.
Tkalec M. came through in three sets.
Marko Tkalec beat Josip Dumanic 2-6 6-3 6-2. Umpiry, "Marko Tkalec vs Josip Dumanic — Croatia F1 Round of 32", https://umpiry.com/match/1998-06-22/dumanic-vs-tkalec-croatia-f1-r32?utm_source=cite (as of 22 June 1998).