Hiroyasu Sato defeated Hyun Woo Nam 4-6 6-3 6-1 in the Japan F1 round of 32 on hard. The upset overturned the form book — Hyun Woo Nam came in leading the head-to-head 1–0. Hiroyasu Sato claimed a first win over Hyun Woo Nam in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-06-26 | Japan F8 | R32 | hard | Hyun Woo Nam | 6-2 4-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.