George Cosac defeated Mihai Vanta 6-2 6-1 in the Romania Masters 4 semi-final on clay. The upset overturned the form book — Mihai Vanta came in leading the head-to-head 1–0, but George Cosac had been the form player, winning 4 of their last 10 on clay. George Cosac claimed a first win over Mihai Vanta in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-08-05 | Austria Masters 2 | R16 | clay | Mihai Vanta | 6-1 6-3 |