Originally from South Africa, Grove began competing in rugby at a young age. Having attended eight different schools growing up, Grove was frequently bullied being the "new kid," and often got into fights as a result. In 1996, Grove moved to London, England, where he worked as a personal trainer, sports therapist, and also worked as a bouncer at an Irish nightclub in South London. In 2000, after Grove and a fellow bouncer were involved in a massive brawl at the nightclub, the two men were forced to take Goju-ryu classes at Daigaku Karate Kai as a way of learning control and self-restraint. Grove soon developed a love for the martial art, which, as a combat-style karate, involves throws and submission wrestling. A year after receiving his black belt in 2005, Grove transitioned into Sambo, Brazilian jiu-jitsu and mixed martial arts.
Grove made his professional debut at UKMMAC 17: Iron Circle on 16 November 2006, beating Anthony Okorie by TKO. He next fought at UKMMAC 18: Fists of Fury against Denniston Sutherland, who was 30 kg lighter than Grove at the time. Grove won by TKO in the first round.
Cage Rage
On 14 July 2007, Grove made his Cage Rage debut at Cage Rage 22: Hard as Hell, stepping in on two days notice to fight PRIDE veteran James Thompson. Grove knocked out the heavily favored Thompson in just 10 seconds of the first round. Grove followed up with two more stoppages in Cage Rage before facing former Cage Rage heavyweight champion Rob Broughton. Grove lost the bout by majority decision. Grove fought in a rematch against Robert Berry at Cage Rage 27: Step Up on 12 July 2008. He won via TKO in the second round. After the fight, Grove called out both Mostapha Al-turk and Kimbo Slice. Grove and Al-turk were scheduled for a heavyweight title fight before Cage Rage closed down.
After Cage Rage fell, Grove went on to Dave O'Donnell's new promotion: Ultimate Challenge MMA. On their very first event, Grove defeated James McSweeney via TKO to win the inaugural Ultimate Challenge Heavyweight title.
On 16 December 2008, Grove announced that he was signing a four-fight deal with the Ultimate Fighting Championship. Grove expressed interest in fighting fellow European standout Mostapha al-Turk, who has also signed with the UFC. He lost his long-awaited UFC debut UFC 95 in London, England, to Mike Ciesnolevicz via Heel hook submission early in the first round. Grove was released from his UFC contract in May.
Return to Ultimate Challenge MMA
After being released from the UFC, he returned to UCMMA as their Heavyweight Champion. Grove defeated Martin Thompson to retain his title. He then fought to a draw with Stav Economou at Ultimate Challenge MMA: Never Back Down.
Bellator
Grove made his Bellator and U.S. debut against Eddie Sanchez, winning via TKO at 1:32 of round 1. He next faced Alexey Oleynik at Bellator 29 and won via TKO at 0:45 in the first round. This win earned Grove a spot in the finals of the, where he faced undefeated wrestler Cole Konrad. Grove lost the fight via submission in the first round. Grove was scheduled to make his return to the promotion at Bellator 43 where he would face alumnus Zak Jensen. However, Grove pulled out of the bout due to an injury. Grove instead fought Jensen at Bellator 47. He won the fight via TKO in the first round. Grove entered the Bellator Season Five Heavyweight Tournament. He faced Mike Hayes at Bellator 52 and lost the back-and-forth bout via split decision. Grove faced Thiago Santos at Bellator 56 in the semi-finals after Blagoi Ivanov pulled out of the bout due to an injury. He lost the fight via submission in the first round.
Grove was scheduled to return to UCMMA at UCMMA 31 to face Darren Towler for the UCMMA heavyweight title, but Towler has been forced out due to a serious shoulder injury. Towler will be replaced by Tomasz Czerwinski and it will be for the interim heavyweight title. Grove snapped his three fight losing streak, knocking out Czerwinski in the first round.
Bellator return
After being away from the sport for two and a half years, Grove is scheduled to return in July 2016. He faced James Mulheron at Bellator 158 on July 16, 2016. Grove lost the fight by unanimous decision. Grove was scheduled to face Łukasz Parobiec on 19 May 2017 at Bellator 170. However, the fight was cancelled for undisclosed reasons.
