Guillermo Perez Roldan defeated Marian Vajda 6-4 7-6 in the Palermo quarter-final on clay. The upset overturned the form book — Marian Vajda came in leading the head-to-head 1–0. Guillermo Perez Roldan claimed a first win over Marian Vajda in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-09-23 | Palermo | R16 | clay | Marian Vajda | 6-2 6-4 |