Ryuso Tsujino defeated Yasufumi Yamamoto 6-2 6-4 in the Japan Masters 2 qualifying round on hard. The upset overturned the form book — Yasufumi Yamamoto came in leading the head-to-head 1–0. Ryuso Tsujino claimed a first win over Yasufumi Yamamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-09-28 | Australia 3 Masters 2 | R32 | hard | Yasufumi Yamamoto | 7-5 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.