Yannick Mertens defeated Jules Okala 7-5 6-0 in the Israel F15 qualifying round on hard. The upset overturned the form book — Jules Okala came in leading the head-to-head 1–0. Yannick Mertens claimed a first win over Jules Okala in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-10-16 | France F24 | R32 | hard | Jules Okala | 2-6 7-5 6-4 |
Averages over each player's completed matches in the selected window (184 vs 112). 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