Todor Enev defeated Yannick Mertens 6-4 6-3 in the Bulgaria 1 4 round of 32 on clay. The upset overturned the form book — Yannick Mertens came in leading the head-to-head 2–0. Todor Enev claimed a first win over Yannick Mertens in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-05-26 | Bulgaria F4 | QF | clay | Yannick Mertens | 6-1 6-1 |
| 2006-09-04 | Bulgaria F3 | QF | clay | Yannick Mertens | 6-2 0-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.