Jason Cook defeated Justin Oneal 6-3 7-5 in the USA F10 round of 64 on hard. The upset overturned the form book — Justin Oneal came in leading the head-to-head 1–0, but Jason Cook had been the form player, winning 3 of their last 5 on hard. Jason Cook claimed a first win over Justin Oneal in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-07-17 | USA 2 Masters 2 | R16 | hard | Justin Oneal | 6-0 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.