Michihisa Onoda defeated Yasufumi Yamamoto 6-2 6-1 in the Japan F4 round of 16 on carpet. The upset overturned the form book — Yasufumi Yamamoto came in leading the head-to-head 2–1. Michihisa Onoda 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) |
| 2000-05-08 | Japan F4 | R16 | hard | Yasufumi Yamamoto | 1-6 6-3 6-4 |
| 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 (4 vs 1). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. Small sample — read as indicative. About