Toshiaki Sakai defeated Michihisa Onoda 6-4 6-3 in the Japan 2 Masters 1 round of 16 on hard. Toshiaki Sakai extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-09-08 | Japan F7 | R16 | hard | Michihisa Onoda | 4-6 6-3 7-5 |
| 2002-04-15 | Japan F2 | R32 | carpet | Toshiaki Sakai | 6-4 7-6(9) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.