Nikolay Sysoev defeated Kian Vakili 6-4 2-6 10-7 in the M15 Santo Domingo 4 q16 on hard. The upset overturned the form book — Kian Vakili came in leading the head-to-head 1–0, but Nikolay Sysoev had been the form player, winning 2 of their last 4 on hard. Nikolay Sysoev claimed a first win over Kian Vakili in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-07-17 | M15 Rochester 1 | Q32 | clay | Kian Vakili | 6-4 1-6 10-8 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.