Lukas Thomas defeated Jaroslav Bulant 6-0 7-6 in the Czechoslovakia Masters 1 round of 16 on clay. The upset overturned the form book — Jaroslav Bulant came in leading the head-to-head 1–0. Lukas Thomas claimed a first win over Jaroslav Bulant in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-08-26 | Czechoslovakia Masters 3 | R32 | clay | Jaroslav Bulant | 4-6 6-4 6-0 |