Head-to-Head
Overview
Masabayashi/ Vithoontien and Kawachi/ Sumizawa have met 1 time so far, all in 2026. Kawachi/ Sumizawa leads 1–0. Their first encounter was at the 2026 M15 Tokyo 2 (R16), won by Kawachi/ Sumizawa.
By surface
- hard0 – 1
Masabayashi/ Vithoontien and Kawachi/ Sumizawa have met 1 time so far, all in 2026. Kawachi/ Sumizawa leads 1–0. Their first encounter was at the 2026 M15 Tokyo 2 (R16), won by Kawachi/ Sumizawa.