Justin Oneal defeated Jason Cook 6-0 6-2 in the USA 2 Masters 2 round of 16 on hard. The upset overturned the form book — Jason Cook came in leading the head-to-head 1–0. Justin Oneal claimed a first win over Jason Cook in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-07-05 | USA F10 | R64 | hard | Jason Cook | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.