Masahide Sakamoto defeated Tasuku Iwami 6-3 6-1 in the Japan 1 Masters 2 round of 32 on hard. The upset overturned the form book — Tasuku Iwami came in leading the head-to-head 2–0. Masahide Sakamoto claimed a first win over Tasuku Iwami in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2002-05-20 | Japan F4 | R32 | hard | Tasuku Iwami | 6-7(4) 6-2 6-4 |
| 2001-10-08 | Hong Kong F2 | R32 | hard | Tasuku Iwami | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.