On January 26, 2008, Spong won the World Full Contact Association (WFCA) World Thaiboxing Cruiserweight Championship by defeating Aurelien Duarte. Following this, he won the "KO World Series 2008" by defeating Nikos Sokolis via knockout in the first round, and defended his WFCA Muay Thai title by finishing Ondrej Hutnik with a left liver punch in the second round. On April 26, 2008, Spong faced Azem Maksutaj at the "K-1 World Grand Prix 2008 in Amsterdam", winning by knockout in the second round. He then defeated Gary Turner via TKO in the first round. On November 29, 2008, he became the inaugural It's Showtime 95MAX World champion after beating Zabit Samedov by unanimous decision.