Andreas Tattermusch defeated Jan Hernych 6-2 7-6 in the Czech Republic Masters 4 qualifying round on hard. The upset overturned the form book — Jan Hernych came in leading the head-to-head 1–0. Andreas Tattermusch claimed a first win over Jan Hernych in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-10-25 | Czech Republic Masters 3 | QF | carpet | Jan Hernych | 6-4 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.