Garreth's professional sporting career started at the age of 19, playing flank at Top Fight Club rugby in Durban at Crusaders Rugby Club.
In 2007, Natal Rugby Union selected him for a program that meant the change from Flank to Hooker with promise of a Natal Sharks rugby contract. one of the requirements was that he increased his fitness levels.
Spending time with the Shark's fitness coach,Jason Venter, who was South Africa's leading MMA coach at the time and used MMA as a form of training, it became clear to Jason that Garreth has a natural ability and he was encouraged to pursue this direction. Garreth agreed to an amateur fight and was hooked. Garreth completed his amateur career, while being nicknamed Soldierboy, undefeated with a 10-0 fight record.
In 2008, after turning professional, Garreth won his first pro fight for ight Club against JP Kruger. He then made the move to Johannesburg to further his career by joining South Africa's Top MMA gym, Fight Fit Militia (FFM). After a tough beginning, with the main focus to rebuild and redefine himself, in 2009 Garreth started fighting for the Extreme Fight Championships (EFC). This began a 3 year undefeated streak and Garreth, not only becoming to EFC Middleweight champion by 2011, but also the face of EFC.
Unfortunately, he lost his title in 2012 to Jeremy Smith but it catapulted him to the road to become the number 1 contender for the title. At the end of 2013, Garreth finished off the year by claiming back the EFC Middleweight Championship title from jeremy Smith.