Daisuke Sumizawa defeated Natthasith Kunsuwan 6-7 7-6 11-9 in the M15 Nonthaburi 1 q32 on hard. The upset overturned the form book — Natthasith Kunsuwan came in leading the head-to-head 1–0. Daisuke Sumizawa claimed a first win over Natthasith Kunsuwan in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-09-21 | M15 Monastir 36 | Q16 | hard | Natthasith Kunsuwan | 2-6 6-3 10-7 |
Averages over each player's completed matches in the selected window (16 vs 4). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About