Mark Nielsen advanced past Donavan September via walkover in the USA 2 Masters 1 round of 32. Mark Nielsen extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-04-17 | USA F10 | R32 | hard | Mark Nielsen | 6-2 7-6(3) |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.