At the
2008 Summer Olympics, Callus was part of the Australian 4 × 100 m freestyle relay team, which won the bronze medal in the event. He also took part in the 50m freestyle finishing a close 4th. In a post swim interview, he said he would not return for a 4th Olympics.
Successful Return Callus made a return in 2009 at the Aus trials, despite clocking thunderous times in the prelims and semi-finals, he failed to beat the younger generation of sprinters in
Eamon Sullivan &
Matthew Abood. In a post swim interview he claimed due to the slow real estate market he had more free time to return to the pool. After what most swimming fans assumed was a quiet retirement, Callus made an unexpected return to the Australian short course championships, clocking a new Australian record in the 50m freestyle. On 26 November at the 2009 International AIS meet, Callus broke Sullivan's Australian record (former world record) in the men's 50m freestyle to clock 21.24 in the mourning prelims. For the second time in a day, taking 0.05 off the mark in the finals and bringing it down to 21.19, making him the 3rd fastest swimmer in history. "At the end of the day it's great to do fast times and see what I can possibly do, and that would have won a medal at Worlds," said Callus. At the
2010 Telstra Trials he won the 50m freestyle in a time of 22.09, at the
2010 Pan Pacs he finished 7th in 22.15. At the
2010 Commonwealth Games he was disqualified in the semi-finals. "It's one of those things," he said. "That's bitterly disappointing ... I could have been up on the dais because I knew I was in good form." Asked if that was his last swim: "Definitely in the Commonwealth Games format. As they say, shit happens." ==Career best times==