By Dan Ambrose: In a significant blow to Top Rank, Jarrell “Big Baby” Miller reportedly has tested for a performance-enhancing substance, and his scheduled July 9 fight against Jerry Forrest has now been canceled. Mike Coppinger is reporting the news. The 32-year-old ‘Big Baby’ Miller (23-0-1, 20 KOs) and Forrest were supposed to be fighting […]