K-1 World MAX 2003 Champions Challenge was a kickboxing event promoted by the K-1 organization. The event was held in Tokyo at the Nippon Budokan, on Tuesday, November 18, 2003. It was a one match showcase event, featuring ten world's best martial artists against Japan's top kickboxers, all fights were fought under K-1 Rules (70 kg/152 lb weight class). In total there were twenty fighters, from seven different countries. The main event featured local favourite Masato against Vince Phillips.