Constant Lestienne defeated Yannick Mertens 7-5 6-3 in the France F4 qualifying round on hard. The upset overturned the form book — Yannick Mertens came in leading the head-to-head 1–0, but Constant Lestienne had been the form player, winning 1 of their last 5 on hard. Constant Lestienne claimed a first win over Yannick Mertens in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-02-24 | France F4 | QF | hard | Yannick Mertens | 6-2 6-3 |
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About