Cengiz Aksu defeated Sergo Sikharulidze 6-1 6-3 in the M15 Sozopol 2 round of 32 on hard. The upset overturned the form book — Sergo Sikharulidze came in leading the head-to-head 1–0. Cengiz Aksu claimed a first win over Sergo Sikharulidze in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-17 | M15 Tbilisi 1 | Q32 | hard | Sergo Sikharulidze | 1-6 6-2 10-7 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.