He played with Beecroft Cherrybrook Rugby club and played his colts rugby with the UC Owls in Canberra where he was selected to play for the Australian U21 and the Brumby Runners.
Alexander also played for the Bedford Blues in what was National Division 1 (now rebranded the RFU Championship) in England during the 2006–07 season.[1]
Alexander made his Brumbies debut in round 3 of the 2008 Super 14 season off the bench in round three against the Queensland Reds, scoring a try to the delight of the Brumbies home crowd, in particular the punters. He went on to play six games off the bench in that season. When the Wallaby squad was named by new coach Robbie Deans Alexander was a surprise inclusion after playing only six games for the Brumbies. He made his test debut against France in Sydney.[citation needed] In 2009, he played in all 13 games for the Brumbies and in all 14 games for the Wallabies.
Alexander became the top try scorer for the Brumbies in 2010, scoring 7 tries from 13 games. Although injury hindered his test season that year, he recovered to play all 5 tests in the Spring Tour.[2]