Clay Walker will be the only artist to perform at Major League Baseball's Home Run Derby on Monday (July 12) in Houston. All active or retired players who have hit at least 500 career home runs have been invited to participate. Those confirmed include Barry Bonds, Ken Griffey Jr., Sammy Sosa and Rafael Palmeiro. First-year participants include Texas' Hank Blalock and Boston's David Ortiz. The Derby begins at 8 p.m. ET, and ESPN will air a portion of Walker's performance.