Jumpei Yamasaki defeated Ryotaro Matsumura 6-1 7-5 in the M15 Osaka 1 round of 32 on hard. The upset overturned the form book — Ryotaro Matsumura came in leading the head-to-head 1–0, but Jumpei Yamasaki had been the form player, winning 4 of their last 8 on hard. Jumpei Yamasaki claimed a first win over Ryotaro Matsumura in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-03-25 | M15 Tsukuba 1 | Q16 | hard | Ryotaro Matsumura | 7-5 7-6(4) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.