Jan Mertl defeated Peter Heller 7-5 6-4 in the Turkey F8 qualifying round on hard. The upset overturned the form book — Peter Heller came in leading the head-to-head 1–0. Jan Mertl claimed a first win over Peter Heller in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-05-15 | Czech Republic F1 | R32 | clay | Peter Heller | 2-6 7-6(7) 7-6(5) |
Averages over each player's completed matches in the selected window (127 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