Dejan Petrovic defeated Joseph Sirianni 6-4 6-2 in the Australia 1 2 round of 16 on hard. The upset overturned the form book — Joseph Sirianni came in leading the head-to-head 4–2. Dejan Petrovic narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-02-02 | Australia 1 4 | R32 | hard | Joseph Sirianni | 6-3 5-7 6-2 |
| 2002-09-23 | Australia 2 1 | SF | hard | Joseph Sirianni | 4-6 6-2 |
| 2001-11-19 | Australia F5 | QF | grass | Joseph Sirianni | 6-3 6-2 |
| 2000-11-20 | Australia F3 | SF | grass | Dejan Petrovic | 7-6(5) 6-4 |
| 1999-09-19 | Australia 3 Masters 3 | F | hard | Dejan Petrovic | 6-3 7-5 |
| 1996-10-27 | Australia 3 Masters 3 | QF | clay | Joseph Sirianni | 6-3 3-6 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.