In 2001 Rooney claimed the world champion title in the 200 m freestyle, winning at the 2001 Fukuoka World Swimming Championships in Japan. This meet was also widely remembered for the disqualification of the Australian women's team after they jumped in the water to celebrate apparent victory in the 4×200-metre freestyle relay: the team of Elka Graham, Petria Thomas and Linda Mackenzie joined anchor swimmer Rooney in the water to celebrate their win, but as it was before all other competitors had finished the event, they were disqualified. Furthermore, the team found out about their disqualification while they were giving a post race interview for television.