Yannick Mertens defeated Daniel Masur 6-2 7-6 in the Portugal F20 qualifying round on hard. The result followed the form book — Yannick Mertens came in leading the head-to-head 1–0. Yannick Mertens extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-06-10 | Germany F5 | R16 | clay | Yannick Mertens | 4-6 7-6(6) 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.