Jason Cook defeated Simon Aspelin 6-4 7-6 in the USA 4 Masters 4 round of 64 on hard. The upset overturned the form book — Simon Aspelin came in leading the head-to-head 1–0. Jason Cook claimed a first win over Simon Aspelin in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-09-05 | USA 5 Masters 2 | QF | hard | Simon Aspelin | 6-2 6-0 |