Horse Racing Radio Network (HRRN), the Eclipse Award-winning broadcast organization based in Lexington, KY and official radio home of the 2015 Triple Crown and Breeders’ Cup World Championships, hosts a full slate of Breeders’ Cup Challenge coverage this weekend beginning Friday with the Grade 1 Darley Alcibiades and G3 Stoll Keenon Ogden Phoenix Stakes from Keeneland.