HALLANDALE BEACH, Fla. The undefeated and untested Big Brown drew the outside post in a field of 12 3-year-olds entered Wednesday for Saturdays $1 million Florida Derby at Gulfstream Park. No horse has ever won a race going 1 1/8 miles at Gulfstream from post 11 or 12 since the racetrack was reconfigured and lengthened to 1 1/8 miles in 2005.