In 2004 he won his last Muay Thai title where he finally got his hands on a world title, defeating Thai superstar Malaipet by decision after five rounds to win the I.S.K.A. world title, something Ludwig considers one of his proudest ever moments. The title fight was also notable as the belt had previously been held by Alex Gong - a rematch between him and Ludwig had been on the card since their bout in 2001 but Gong died in 2003. After this victory Duane would become increasingly involved in MMA at the expense of his Kickboxing career, although he would have a number of K-1 fights up until 2006, finishing with a 4-7-1 record with the organization. Mixed martial arts career Ludwig was trained by Bas Rutten during his early career. Although not an official title match, Ludwig nonetheless beat Jens Pulver, who was at the time ranked as the #1 Lightweight mixed martial artist in the world by many outlets, by first round K.O. UFC At UFC 42, Duane Ludwig fought Genki Sudo. Sudo showed his theatrical side, walking backwards towards Ludwig and doing the robot dance before taking him down. Despite the initial domination by Sudo, Ludwig started inflicting damage while standing, avoiding a rolling kneebar and several takedown attempts. Whilst it seemed the momentum had shifted in Ludwig's favor, Sudo came back in the third round and took him down, pounding and bloodying him with punches and elbows. Whilst Ludwig was taking a beating, referee John McCarthy interrupted and stood the two fighters up to check on Ludwig's nose. When the doctor allowed the fight to resume they did not restart from the same previous dominant position held by Sudo. Ludwig took advantage of the indirect rest given to him and avoided, with the aid of the referee's decision, the unfavorable position that he was in. He dominated the end of the fight landing hurtful shots on Sudo to win a split decision. Ludwig mocked Sudo after the final bell with a crane kick pose. Notorious fast knockout At UFC Fight Night 3, Ludwig faced Jonathan Goulet. Ludwig won the fight via quick knockout, though many fans disagreed with the timekeeping of the finish, which was 11 seconds despite the referee pulling Ludwig away from Goulet at around the 6 second mark. Following multiple online campaigns to overturn the timekeeping error, on Christmas Eve 2011, UFC