Yaoki Ishii defeated Hiroki Ishii 7-5 6-4 in the Brazil 3 Masters 2 round of 16 on hard. The result followed the form book — Yaoki Ishii came in leading the head-to-head 1–0. Yaoki Ishii extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-03-16 | Japan F1 | R32 | clay | Yaoki Ishii | 6-0 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.