Tasuku Iwami defeated Hideki Kaneko 6-2 6-2 in the Japan F2 round of 16 on hard. The upset overturned the form book — Hideki Kaneko came in leading the head-to-head 2–1. Tasuku Iwami narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-26 | USA F12 | R64 | hard | Hideki Kaneko | 6-2 6-2 |
| 1999-04-28 | Indonesia F2 | R32 | hard | Tasuku Iwami | 7-5 2-6 7-5 |
| 1996-06-09 | Japan 1 Masters 4 | R32 | hard | Hideki Kaneko | 6-4 6-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.