Marq Foster defeated Donavan September 6-2 6-3 in the USA F3 round of 64 on clay. The upset overturned the form book — Donavan September came in leading the head-to-head 3–0. Marq Foster claimed a first win over Donavan September in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-07-06 | USA F8 | R64 | hard | Donavan September | 6-4 3-1 |
| 1998-03-27 | USA 1 Masters 1 | R64 | hard | Donavan September | 3-6 6-2 6-2 |
| 1996-04-05 | USA 1 Masters 2 | R32 | hard | Donavan September | 6-3 6-3 |