Milen Velev defeated Thierry Grin 6-1 7-6 in the Germany 3 Masters 2 round of 32 on clay. The upset overturned the form book — Thierry Grin came in leading the head-to-head 1–0. Milen Velev claimed a first win over Thierry Grin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-02-03 | Germany 1 Masters 2 | R32 | carpet | Thierry Grin | 6-3 7-5 |