Sellathurai was part of the Australian men's squad which won its first team gold medal in the Commonwealth Games at the 2010 event in New Delhi, which was sealed by his performance on the rings.[2] He also won the pommel horse event in Delhi.
He is a three-time medallist on the pommel horse at the World Championships (two bronzes and one silver). He was a resident of Sydney, New South Wales.
He now volunteers at Milton Keynes Gymnastics, England.