Johannes Haerteis defeated Julian Lenz 3-6 7-6 7-6 in the Ludwigshafen CH round of 64 on clay. The upset overturned the form book — Julian Lenz came in leading the head-to-head 2–1. Johannes Haerteis narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-02-05 | Switzerland F1 | R32 | carpet | Julian Lenz | 2-6 6-1 6-4 |
| 2017-05-22 | Czech Republic F2 | SF | clay | Julian Lenz | 6-1 6-4 |
| 2016-08-08 | Germany F10 | QF | clay | Johannes Haerteis | 7-5 3-6 6-3 |
Averages over each player's completed matches in the selected window (190 vs 178). 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