 On February 4, 2008 at K-1 European Qualification Kemayo knocked out Sergei Gur and qualified for K-1 World GP 2008 in Amsterdam, Netherlands.On May 21, 2010 Kemayo fought at the K-1 World Grand Prix 2010 in Bucharest.In the first round he surprisingly beat the third tournament favourite, Sergei Lascenko in an overwhelming decision.