Jason Cook defeated Jeff Morrison 7-6 6-2 in the USA F10 round of 32 on hard. The upset overturned the form book — Jeff Morrison came in leading the head-to-head 1–0. Jason Cook claimed a first win over Jeff Morrison in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-07-17 | USA 2 Masters 3 | R32 | hard | Jeff Morrison | 7-6 4-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.