Lester Cook defeated Denis Zivkovic 6-2 5-7 6-4 in the USA F23 round of 16 on hard. The upset overturned the form book — Denis Zivkovic came in leading the head-to-head 1–0. Lester Cook claimed a first win over Denis Zivkovic in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-10-02 | USA F25 | R32 | hard | Denis Zivkovic | 4-6 6-3 6-4 |