Tasuku Iwami defeated Norikazu Sugiyama 6-4 6-3 in the Japan F4 qualifying round on hard. The result followed the form book — Tasuku Iwami came in leading the head-to-head 2–1. Tasuku Iwami extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-09-05 | Japan F10 | SF | hard | Tasuku Iwami | 6-0 3-6 7-6(5) |
| 2003-10-20 | Sri Lanka F1 | R16 | clay | Norikazu Sugiyama | 5-0 |
| 1999-05-12 | Japan F3 | R32 | hard | Tasuku Iwami | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.