Blood Rising against KroniK. They lost it the next night on Nitro against the team of Rey Mysterio and Juventud Guerrera. His last WCW match came at a house show on September 23, 2000, in Lubbock, TX against Sting. After leaving WCW, a no-compete clause in his WCW contract prevented him from competing in the World Wrestling Federation. All Japan Pro Wrestling Triple Crown Heavyweight Champion (2001–2003) Muto, as a member of New Japan Pro-Wrestling, made part-time appearances to All Japan in 2001, fighting Toshiaki Kawada and "Dr. Death" Steve Williams in major singles matches on pay-per-view. 2001 proved to be Muto's year of renewal besides the formation of his BATT unit in New Japan, as he challenged, and defeated Genichiro Tenryu for All Japan's coveted Triple Crown Heavyweight Championship on June 8. In Muto's first title defense on July 14, Steve Williams lost to Muto for the Triple Crown Heavyweight Championship in a pay-per-view main event, where it ended in an altercation. After leaving the backstage area Williams would then going on a huge swearing tirade, where he kicked a trash can, was about to cry in tears, and then throwing his armpads to the ground while swearing again. Such scenes never happened in the traditional All Japan and was characteristic to the "crash TV" style of Vince Russo's writing. This would ultimately lead Muto to a grudge feud with Williams into 2002. On January 11, 2002, following the end of a year-long cross-promotional angle with New Japan Pro-Wrestling, Keiji Muto shocked the Japanese wrestling world by defecting to All-Japan as a full-time competitor, taking Satoshi Kojima and Kendo Kashin with him. In his first match as an AJPW contracted wrestler, Muto and Taiyo Kea successfully defended the World Tag Team Championship against Mike Barton and Jim Steele on January 14. Muto would then lose the Triple Crown Heavyweight Championship to Toshiaki Kawada on February 24. Returning to his grudge feud with Steve Williams, Muto had a singles match againt Williams on pay-per-view, which Williams ultimately won and got his revenge for losing the year prior. In April, Muto participated in the 2002 Champion Carnival, where he lost only two matches in his block while winning the rest of his matches and thus advancing to the knockout stage on April 10, where he defeated Satoshi Kojima in the semi-final and Mike Barton (Bart Gunn) in the final to win