Patrick Mayer (GER) defeated Valentin Guenther 6-1 3-6 11-9 in the M15 Oslo 1 q16 on hard. The upset overturned the form book — Valentin Guenther came in leading the head-to-head 1–0. Patrick Mayer (GER) claimed a first win over Valentin Guenther in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-08-15 | Germany F11 | Q32 | clay | Valentin Guenther | 6-3 4-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.