In 2003, he fought for the first time at a grungy and smokey bar and came home with a victory over his opponent in an unanimous decision. Since that time he has fought in various parts of Canada - Toronto, London, Montreal and Vancouver as well he represented Canada on two separate occasions in Ohio in Mixed Martial Arts competitions. Also, he represented Canada in the World Amateur Muay Thai Championships in June 2006 held in Bangkok, Thailand. Recently he won the CMTA North American Championship in Vancouver, BC.

Sylvester has a very particular style that is more geared towards fighting (as seen in K-1), that incorporates the use of heavy hand combinations (as seen in boxing), combined with heavy kicks, elbows and his favorite: knees. His footwork and combinations set him apart from majority of fighters both in Muay Thai and MMA. His classes focus on conditioning as well as the importance of footwork in collaboration with traditional Muay Thai techniques.

Sylwester is also a certified Thai boxing coach through the CASK organization.

Sylvester is the CASK National Low Kick Champion.