Mauricio Alvarez Guzman defeated Denis Merkulov 6-1 6-4 in the Spain F37 q64 on clay. The upset overturned the form book — Denis Merkulov came in leading the head-to-head 1–0. Mauricio Alvarez Guzman claimed a first win over Denis Merkulov in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-07-20 | Lithuania F1 | Q16 | clay | Denis Merkulov | 7-5 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.