SARATOGA SPRINGS, N.Y. - Undefeated GI Kentucky Oaks heroine and Godolphin homebred Good Cheer (Medaglia d'Oro) will put her perfect seven-for-seven record on the line as she takes on six rivals in Friday's GI DK Horse Acorn S. at the Belmont Stakes Racing Festival at Saratoga Race Course. The Acorn is one of six graded stakes races on Friday's 14-race program, which also features three other Grade I events--the GI Ogden Phipps S., a 'Win and You're In' for the GI Breeders' Cup Distaff at Del Mar; the GI New...