In 2013, he signed a contract tying him to the Western Province and Stormers until the end of 2015. 2013 saw the departure of Duvenhage and Groom was now in a one-on-one fight with Louis Schreuder for the Stormers and Province number 9 jersey and as a result he saw much more game time.
He plays as a scrum-half for the Stormers in Super Rugby and Western Province in the Currie Cup and Vodacom Cup. A winner of the Varsity Cup with UCT in 2011, Groom received a swift call up to the Stormers side at the tail-end of the Super Rugby season to replace the injured Dewaldt Duvenhage and Ricky Januarie and he made a couple of substitute appearances. The next 18 months were to see him limited to Western Province appearances and he was a Currie Cup winner with the Streeptruie in 2012. He was a Currie Cup runner up in 2013 and he largely had to make do with appearances from the substitutes bench as Schreuder stole a march in the battle to be first choice scrum-half. However, he was to become a Currie Cup winner again in 2014, this time against the Golden Lions in a season which had seen him edge ahead of Louis Schreuder both at Super Rugby level where he started 12 of 16 games in a tough campaign and also domestically where he started 7 of 9 games and scored 1 try in the process.
