Of Samoan descent, Roberts is the cousin of soccer players Tim Cahill and Chris Cahill. He was educated at John Therry Catholic High School, Rosemeadow, and Patrician Brothers' College, Fairfield, alongside Sharks centre Dean Collis.
Joining the Canterbury-Bankstown Bulldogs in 2006 as a five-eighth, Roberts was originally recruited from Western Suburbs Magpies before became a regular member of the NSWRL Premier League team. In 2007 he has started in halfback in the early rounds due to injury to regular playmaker Brent Sherwin. With Sherwin's return from injury and form, Roberts was shifted to five-eighth.
5 years later he was selected for Samoa in April 2013, for a test match against Tonga in Penrith, New South Wales. Later in the year he was selected for Samoa again, but this time for their 2013 Rugby League World Cup campaign. He featured in all 4 games that the Samoans played, scoring two tries. He scored one try against heavyweights New Zealand in an entertaining 42-24 defeat. He scored his second try in Samoa's 38-4 thrashing of The Kumuls.
On 23 January 2014, it was announced he had signed on with the Melbourne Storm for the 2014 season.
Super League Career
He played his first Super League game against the Catalans Dragons in the second round of the season. He scored his first Super League try against the Warrington Wolves in Round 9.
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As of 11 April 2015
- "Kiwis select Sonny Bill". Sky Sports. 8 August 2008. http://www.skysports.com/story/0,19528,12196_3949034,00.html. Retrieved 8 August 2008.
- "Samoa, Tonga and Fiji name squads". BBC. 8 October 2008. Archived from the original on 13 October 2008. http://news.bbc.co.uk/sport1/hi/rugby_league/7658506.stm. Retrieved 9 October 2008.