Martin Blasko defeated Marek Semjan 7-6 5-7 7-6 in the Czech Republic F4 round of 32 on clay. The upset overturned the form book — Marek Semjan came in leading the head-to-head 2–0. Martin Blasko claimed a first win over Marek Semjan in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-07-11 | Czech Republic F6 | R32 | clay | Marek Semjan | 5-7 6-4 6-1 |
| 2015-07-20 | Slovakia F2 | R32 | clay | Marek Semjan | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.