Tasuku Iwami defeated Toshiaki Sakai 6-4 6-2 in the Korea Rep F4 round of 16 on hard. The upset overturned the form book — Toshiaki Sakai came in leading the head-to-head 1–0, but Tasuku Iwami had been the form player, winning 1 of their last 4 on hard. Tasuku Iwami claimed a first win over Toshiaki Sakai in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1996-11-04 | Japan 2 Masters 4 | R32 | hard | Toshiaki Sakai | 6-2 4-6 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.