Yasufumi Yamamoto defeated Michihisa Onoda 1-6 6-3 6-4 in the Japan F4 round of 16 on hard. The upset overturned the form book — Michihisa Onoda came in leading the head-to-head 2–1. Yasufumi Yamamoto narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-05-15 | Japan F5 | R32 | hard | Michihisa Onoda | 6-2 7-6(7) |
| 1998-10-07 | Japan F4 | R16 | carpet | Michihisa Onoda | 6-2 6-1 |
| 1998-09-30 | Japan F3 | R32 | carpet | Yasufumi Yamamoto | 1-6 6-1 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.