Issei Okamura defeated Koki Matsuda 6-1 6-2 in the M25 Kashiwa 1 q16 on hard. The upset overturned the form book — Koki Matsuda came in ranked #451, leading the head-to-head 3–0. Issei Okamura claimed a first win over Koki Matsuda in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-03-31 | M15 Kashiwa 1 | Q16 | hard | Koki Matsuda | 6-2 6-4 |
| 2024-03-11 | M15 Hinode 1 | Q16 | hard | Koki Matsuda | 6-4 6-3 |
| 2023-06-27 | M15 Jakarta 5 | R32 | hard | Koki Matsuda | 6-3 7-6(6) |
Averages over each player's completed matches in the selected window (80 vs 117). ATP, WTA & Challenger.
Matsuda K.: 14 days rest · 1 match (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