Isaac Frost defeated Matheson Klein 7-6 7-5 in the Australia F6 round of 32 on hard. The upset overturned the form book — Matheson Klein came in leading the head-to-head 1–0. Isaac Frost claimed a first win over Matheson Klein in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-04-27 | Australia F3 | R16 | clay | Matheson Klein | 6-4 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.