Yaoki Ishii defeated Michihisa Onoda 6-3 6-4 in the Japan F4 round of 16 on hard. The result followed the form book — Yaoki Ishii came in leading the head-to-head 3–1. Yaoki Ishii extended the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-01-08 | USA F1 | QF | hard | Michihisa Onoda | 7-6(1) 6-4 |
| 1999-10-25 | Japan F6 | QF | carpet | Yaoki Ishii | 7-6 3-6 7-5 |
| 1999-03-24 | Japan F2 | F | carpet | Yaoki Ishii | 6-2 4-6 6-2 |
| 1996-06-09 | Japan 1 Masters 2 | R32 | hard | Yaoki Ishii | 6-7 6-1 7-6 |
Averages over each player's completed matches in the selected window (2 vs 3). 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