G. J. Kim defeated Colin Sinclair 7-6 6-3 in the M25 Harmon 2 round of 32 on hard. The upset overturned the form book — Colin Sinclair came in ranked #509, leading the head-to-head 2–0. G. J. Kim claimed a first win over Colin Sinclair in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-06-12 | M15 Harmon 1 | R16 | hard | Colin Sinclair | 6-4 6-0 |
| 2022-08-17 | M15 Anseong 1 | R32 | clay | Colin Sinclair | 7-5 6-2 |
Averages over each player's completed matches in the selected window (39 vs 200). ATP, WTA & Challenger.
Sinclair C.: 8 days rest · 3 matches (14d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About