Michihisa Onoda defeated Mark Nielsen 6-3 6-1 in the Japan F7 quarter-final on hard. Michihisa Onoda extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-08-30 | Japan F6 | QF | hard | Mark Nielsen | 6-4 7-6(2) |
| 2004-04-12 | Japan F1 | SF | carpet | Michihisa Onoda | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.