Tomas Cakl defeated Martin Vacek 6-0 6-2 in the Czech Republic Masters 4 round of 32 on carpet. The upset overturned the form book — Martin Vacek came in leading the head-to-head 1–0. Tomas Cakl claimed a first win over Martin Vacek in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-08-16 | Slovak Republic Masters 4 | R32 | clay | Martin Vacek | 7-5 2-6 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.