Sergio Cortes defeated Martin Zumpft 7-5 6-3 in the Germany 3 Masters 3 round of 16 on clay. The result followed the form book — Sergio Cortes came in leading the head-to-head 1–0. Sergio Cortes extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-05-27 | Germany 3 Masters 2 | R32 | clay | Sergio Cortes | 6-1 6-4 |