Rene Hanak defeated Thomas Gollwitzer 6-4 6-2 in the Czechoslovakia Masters 4 final on clay. The upset overturned the form book — Thomas Gollwitzer came in leading the head-to-head 1–0. Rene Hanak claimed a first win over Thomas Gollwitzer in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-08-26 | Czechoslovakia Masters 1 | R32 | clay | Thomas Gollwitzer | 6-7 6-0 6-1 |