Colin Sinclair defeated Jake Delaney 6-3 6-7 6-3 in the M25 Cairns 2 round of 32 on hard. The upset overturned the form book — Jake Delaney came in leading the head-to-head 1–0. Colin Sinclair claimed a first win over Jake Delaney in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-04-02 | M15 Kashiwa 1 | R32 | hard | Jake Delaney | 4-6 7-6(0) 7-6(3) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.