Denis Merkulov defeated Mauricio Alvarez Guzman 7-5 6-2 in the Lithuania F1 q16 on clay. The upset overturned the form book — Mauricio Alvarez Guzman came in leading the head-to-head 1–0. Denis Merkulov claimed a first win over Mauricio Alvarez Guzman in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-10-28 | Spain F37 | Q64 | clay | Mauricio Alvarez Guzman | 6-1 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.