Mauricio Alvarez Guzman defeated Teodor Nicolae Marin 6-3 1-6 6-4 in the Croatia F6 qualifying round of 128 on clay. The upset overturned the form book — Teodor Nicolae Marin came in leading the head-to-head 1–0. Mauricio Alvarez Guzman claimed a first win over Teodor Nicolae Marin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-06-06 | Romania F3 | R32 | clay | Teodor Nicolae Marin | 7-5 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.