Hyun Woo Nam defeated Hiroyasu Sato 6-2 4-6 6-3 in the Japan F8 round of 32 on hard. The upset overturned the form book — Hiroyasu Sato came in leading the head-to-head 1–0. Hyun Woo Nam claimed a first win over Hiroyasu Sato in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-04-10 | Japan F1 | R32 | hard | Hiroyasu Sato | 4-6 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.