Unbeaten 'TDN Rising Star' Annex (Constitution) looks to keep his perfect record in tact as the favorite in the GII American Turf S. at Churchill Downs. Rallying from well back to take his debut at Gulfstream Jan. 16, the chestnut captured the Palm Beach S. there Feb. 27 and followed suit with a win in the Cutler Bay S. in Hallandale Mar. 27. The red-hot Irad Ortiz, Jr. climbs aboard for the first time here, which adds even more upside to this talented favorite. Shug McGaughey saddles a strong contender...