A full field of 12 and three also-eligibles have been entered for Saturday's GIII Runhappy Turf Sprint at Kentucky Downs, a 'Win and You're In' qualifier for the GI Breeders' Cup Turf Sprint at Keeneland Nov. 7. The six-furlong dash will offer up one of the afternoon's toughest handicapping challenges to boot. Totally Boss (Street Boss) pounced from just off the pace to scoop this valuable prize by 1 1/4 lengths last year, then lost all chance when steadied three furlongs from home in the Breeders' Cup Sprint and finished...