Head-to-Head
Overview
Colin Sinclair and T. Kumasaka have met 1 time so far, all in 2026. T. Kumasaka leads 1–0. Their first encounter was at the 2026 Astana (R32), won by T. Kumasaka.
By surface
- hard (indoor)0 – 1
Colin Sinclair and T. Kumasaka have met 1 time so far, all in 2026. T. Kumasaka leads 1–0. Their first encounter was at the 2026 Astana (R32), won by T. Kumasaka.