Andy Roddick's much-hyped TV debut is facing sudden death. As reported in the new issue of TV Guide magazine, the tennis ace has backed out of The Tour, the upcoming reality show that was to shadow him this summer as he dealt with fame, fortune and significant other Mandy Moore. "Andy wanted to focus all of his energy on being the No. 1 player in the world," says Tour creator Craig H. Shepherd, who has tapped another "well-known American" sports stud — James Blake — to hold court in his place. Although The Tour has yet to find a home, Shepherd says several major networks have expressed interest.