Wayne Arthurs defeated Jason Cask 6-3 6-4 in the Australia 3 Masters 1 round of 32 on clay. The upset overturned the form book — Jason Cask came in leading the head-to-head 1–0. Wayne Arthurs claimed a first win over Jason Cask in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-02-10 | Australia 1 Masters 2 | R32 | carpet | Jason Cask | 6-7 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.