 Kemayo joined Faucon Gym in 1999 and has been training there under Bingo and Richard Roudy ever since.In 2002 he became the French Kickboxing Champion and in 2003 made his K-1 debut in Milan, Italy at the K-1 Preliminary Tournament.His first success in K-1 came on April 16, 2005 at K-1 2005 Italy, when he defeated Lorenzo Borgomeo and Ionut Iftimoaie and reached the tournament finals, where he was stopped by Alexander Ustinov by unanimous decision.