Matthias Kolbe defeated Gleb Alekseenko 6-4 2-6 7-6 in the Bulgaria F2 round of 32 on clay. The upset overturned the form book — Gleb Alekseenko came in leading the head-to-head 1–0. Matthias Kolbe claimed a first win over Gleb Alekseenko in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-16 | Bulgaria F3 | R32 | clay | Gleb Alekseenko | 6-1 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.