Adam Gusky defeated Donnie Isaak 6-3 6-1 in the USA 1 Masters 3 round of 32 on clay. The upset overturned the form book — Donnie Isaak came in leading the head-to-head 1–0. Adam Gusky claimed a first win over Donnie Isaak in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-04-23 | USA 2 Masters 4 | R32 | hard | Donnie Isaak | 6-2 6-2 |