He returned at UFC 42 against Duane Ludwig. Again Sudo showed his theatrical side, walking backwards towards Ludwig and doing the robot dance before taking him down. However, despite his initial domination, the Japanese started receiving damage while standing, failing in a rolling kneebar and several takedown attempts. Sudo came back at the last round, taking down Ludwig and 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.