Yannick Mertens defeated Pierrick Ysern 7-6 6-3 in the France F15 round of 16 on hard. The upset overturned the form book — Pierrick Ysern came in leading the head-to-head 1–0. Yannick Mertens claimed a first win over Pierrick Ysern in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-21 | France F15 | R16 | hard | Pierrick Ysern | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.