Peter Clarke defeated Joseph Sirianni 2-6 6-1 6-4 in the Australia F4 qualifying round on hard. The upset overturned the form book — Joseph Sirianni came in leading the head-to-head 3–2. Peter Clarke narrowed the head-to-head to 3–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2002-01-28 | Australia 1 3 | QF | hard | Peter Clarke | 7-6(5) 7-6(4) |
| 2001-01-29 | Australia 1 4 | F | hard | Joseph Sirianni | 6-4 7-5 |
| 1999-11-01 | Australia F2 | QF | clay | Joseph Sirianni | 7-5 7-6 |
| 1999-09-19 | Australia 3 Masters 3 | SF | hard | Joseph Sirianni | 6-3 6-3 |
| 1999-02-28 | Australia 1 Masters 4 | R32 | clay | Peter Clarke | 7-5 6-7 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.