Kotaro Miyachi defeated Masahide Sakamoto 6-3 7-5 in the Japan 1 Masters 4 round of 32 on hard. The upset overturned the form book — Masahide Sakamoto came in leading the head-to-head 1–0. Kotaro Miyachi claimed a first win over Masahide Sakamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-09-10 | Japan F6 | R16 | hard | Masahide Sakamoto | 3-6 6-2 2-0 |