Mark Nielsen defeated Ryuso Tsujino 6-3 6-3 in the Japan F4 round of 16 on hard. Mark Nielsen extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-06-07 | Japan 1 Masters 1 | QF | hard | Mark Nielsen | 6-2 6-4 |
| 1996-05-17 | USA 2 Masters 2 | QF | clay | Ryuso Tsujino | 6-0 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.