At the 2008 Telstra Trials he qualified in the 100 m and the 200 m backstroke, placing first and second respectively to qualify for the Olympics in Beijing. He left Beijing with a silver in the 4 × 100 m medley relay, and a fifth place finish in the 100m backstroke.
In 2009, he won all three backstroke events at the 2009 Telstra Trials, setting national records in the 50 and 200 m. At the World Championships, with arguably Australia's strongest leg absent (freestyler Eamon Sullivan), the medley relay team was overhauled by Germany, finishing with bronze.
In 2010 Delany was bested by longtime rival Hayden Stoeckel in all three backstrokes at the Australian Championships. At the 2010 Pan Pacific Swimming Championships, Delaney won bronze in the 100 m backstroke. He backed up his form on the second night, taking silver in the 50 m. Night 3 saw him finish 4th in the 200m backstroke. On the final night Delaney collected another bronze in the medley relay.