[2] At the end of the 2007–08 season, Holmes decided to return home to Adelaide and re-joined the 36ers.

Holmes, who juggled his time between being a professional basketball player and a law student, made such an impact with the Crocodiles that halfway through the season the club announced they had signed Holmes for another two seasons.

[5][6] On 7 August 2015, he retired from professional basketball to continue on as the full-time president of the NBL Players Association.

[8] Holmes was a member of the Australian Boomers team that won the 2005 FIBA Oceania Championship.

He also won the gold medal playing for Australia at the 2006 Commonwealth Games held in Melbourne.