Colin Sinclair defeated Matthew Dellavedova 7-6 6-4 in the M25 Perth 1 round of 16 on hard. The upset overturned the form book — Matthew Dellavedova came in leading the head-to-head 1–0. Colin Sinclair claimed a first win over Matthew Dellavedova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-19 | M25 Tamworth 2 | QF | hard | Matthew Dellavedova | 6-4 6-7(6) 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.