text: World Wrestling Federation / World Wrestling Entertainment / WWE (2000–2019)
  The Radicalz; Light Heavyweight Champion (2000–2001)
  After being granted his release from WCW the night after his last WCW match, Malenko signed with the World Wrestling Federation (WWF) and debuted during the Attitude Era on January 31, 2000, edition of Raw Is War. Malenko first appeared in the crowd with the infamous Radicalz – himself, Eddie Guerrero, Chris Benoit, and Perry Saturn – who all made exits from WCW at the same time. While not having as much success in the WWF, Malenko was a force in the promotion's light heavyweight division. Along with Guerrero, Benoit, and Saturn, he had some measure of success as part of The Radicalz. On the March 13 edition of Raw Is War, Malenko defeated Essa Rios for his first Light Heavyweight Championship. In April 2000, he feuded with Scotty 2 Hotty who was the new challenger for his Light Heavyweight title. He dropped the title to Scotty on the April 17 edition of Raw Is War before he won his second WWF Light Heavyweight Championship from Scotty on the April 27 episode of SmackDown!. At Backlash 2000, Malenko successfully defended the title against Scotty, thus ending the feud between the two.