| Year,Competition,Venue,Position,Event,Notes | |
| Representing Australia,Representing Australia,Representing Australia,Representing Australia,Representing Australia,Representing Australia | |
| 1990,Commonwealth Games,"Auckland, New Zealand",1st,4 × 100 m relay,43.87 | |
| 1990,World Junior Championships,"Plovdiv, Bulgaria",15th (sf),100m,11.87 (wind: -1.3 m/s) | |
| 1990,World Junior Championships,"Plovdiv, Bulgaria",5th,200m,23.61 (wind: +1.3 m/s) | |
| 1990,World Junior Championships,"Plovdiv, Bulgaria",5th,4 × 100 m relay,45.01 | |
| 1992,Summer Olympics,"Barcelona, Spain",7th,4 × 400 m relay,3:26.42 | |
| 1992,World Junior Championships,"Seoul, South Korea",2nd,200m,23.25 (wind: +0.3 m/s) | |
| 1992,World Junior Championships,"Seoul, South Korea",6th,4 × 400 m relay,3:36.28 | |
| 1994,Commonwealth Games,Victoria Canada,1st,200 m,22.25 | |
| 1994,Commonwealth Games,Victoria Canada,1st,400 m,50.38 | |
| 1994,Commonwealth Games,Victoria Canada,2nd,4 × 100 m relay,43.43 | |
| 1994,IAAF Grand Prix Final,"Paris, France",2nd,400 m,50.04 | |
| 1995,World Championships,"Gothenburg, Sweden",4th,400 m,50.60 | |
| 1995,World Championships,"Gothenburg, Sweden",3rd,4 × 400 m relay,3:25.88 | |
| 1996,Summer Olympics,"Atlanta, United States",2nd,400 m,48.63 | |
| 1996,IAAF Grand Prix Final,"Milan, Italy",1st,400 m,49.60 | |
| 1997,World Championships,"Athens, Greece",1st,400 m,49.77 | |
| 1999,World Championships,"Seville, Spain",1st,400 m,49.67 | |
| 1999,World Championships,"Seville, Spain",6th,4 × 400 m relay,3:28.04 | |
| 1999,World Indoor Championships,"Maebashi, Japan",2nd,4 × 400 m relay,3:26.87 | |
| 2000,Summer Olympics,"Sydney, Australia",6th,200 m,22.53 | |
| 2000,Summer Olympics,"Sydney, Australia",1st,400 m,49.11 | |
| 2000,Summer Olympics,"Sydney, Australia",5th,4 × 400 m relay,3:23.81 | |
| 2002,Commonwealth Games,"Manchester, Great Britain",1st,4 × 400 m relay,3:25.63 | |