Career
A forward, he has played his entire career to date at the Raiders. Previous to first-grade football, Fensom played for the Bellingen Dorrigo Magpies and gained representative honours in his youth and junior years with New South Wales Under 18"s and New South Wales Country at the same age. He was the captain of Canberra in the 2008 season of the Toyota Cup and was the lock in their successful grand final.
He was also named at loose-forward in the Toyota Cup team of the year in 2008.
He played the following round, again in an interchange role, in a 16-10 loss away to the Gold Coast Titans. In 2010, he scored his first try in the NRL in round 4 against the Wests Tigers.
Fensom is the current co-holder (with Nathan Hindmarsh) of the world record for the most tackles made in a single game: in Round 11 of the 2011 NRL season he made 75 tackles against the Canterbury-Bankstown Bulldogs. He went on to make a club record 1135 tackles for the season, breaking the record previously held by Alan Tongue.
Fensom was regularly the first choice at lock during the 2011 season, playing in 24 games, and was named as the Raiders player of the year.
In 2011, Fensom received 24 votes, which was nine ahead of second-placed Dane Tilse with 15. Fensom finished with 25 points at the end of the 2012 season, five ahead of Reece Robinson. Fensom is known for his extremely high work rate, particularly in regards to tackling.
In the 2012 season, he averaged 43.3 tackles per game.
Due to his consistent high work rate, he is one of the top players in the NRL Dream Team competition, which gives each player a points score based on their statistics in each game. As of the start of the 2013 season, Fensom was the 6th most expensive player in NRL Dream Team.
First Grade Debut: Round 5, Cronulla Sharks 14 v 24 Canberra Raiders at Toyota Stadium, 11 April 2009 World Record Holder: Round 11, 75 Tackles vs Canterbury-Bankstown Bulldogs at Canberra Stadium, 20 May 2011 2007 Canberra Raiders Jersey Flegg Coaches Award.