Thomas Muster defeated Guillermo Perez Roldan 7-5 6-0 in the Umag quarter-final on clay. The result followed the form book — Thomas Muster came in leading the head-to-head 3–0. Thomas Muster extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-09-09 | Geneva | R16 | clay | Thomas Muster | 4-6 6-1 6-2 |
| 1990-04-30 | Munich | R32 | clay | Thomas Muster | 6-4 6-4 |
| 1990-03-05 | Casablanca | F | clay | Thomas Muster | 6-1 6-7 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.