Aliaksandr Liaonenka defeated Mikalai Haliak 6-2 6-0 in the M15 Maanshan 1 round of 32 on hard. The upset overturned the form book — Mikalai Haliak came in ranked #905, leading the head-to-head 2–0. Aliaksandr Liaonenka claimed a first win over Mikalai Haliak in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-04-16 | M25 Shymkent 2 | Q16 | clay | Mikalai Haliak | 7-6(2) 7-5 |
| 2017-08-14 | Belarus F2 | R32 | hard | Mikalai Haliak | 6-7(6) 7-6(8) 7-6(5) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.