John Loy Rocker is an American former professional baseball relief pitcher who played six seasons in Major League Baseball (MLB), primarily with the Atlanta Braves. Rocker made his major league debut in 1998 with the Braves, where he spent four seasons and was later a member of the Cleveland Indians, Texas Rangers and Tampa Bay Devil Rays. He last played professionally for the Long Island Ducks of the Atlantic League of Professional Baseball in 2005.