Alexander Klintcharov defeated Colin Sinclair 6-4 6-4 in the M25 Brisbane 1 round of 32 on hard. The upset overturned the form book — Colin Sinclair came in leading the head-to-head 1–0. Alexander Klintcharov claimed a first win over Colin Sinclair in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-03-06 | M25 Mildura 1 | R32 | grass | Colin Sinclair | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.