Federico Mordegan defeated Marc Kevin Goellner 6-4 3-6 6-3 in the Bologna round of 16 on clay. The upset overturned the form book — Marc Kevin Goellner came in leading the head-to-head 1–0. Federico Mordegan claimed a first win over Marc Kevin Goellner in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-03-04 | Spain 3 Masters 3 | R32 | clay | Marc Kevin Goellner | 2-6 7-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.