Fresh off a pair of wins to launch her sophomore campaign, D J Stable's Nitrogen (Medaglia d'Oro) closed from off the pace to annex Tuesday's GII Appalachian Stakes at Keeneland. Content to survey a moderate opening pace of :23.31 and :47.45 set by longshot Fast Market (Volatile) from near midpack, the 6-5 choice began to mount her challenge while swinging to the outside turning for home. Gaining control midstretch, the favorite drifted out slightly, however, drew clear and was able to maintain a comfortable advantage late, finishing 2 1/4 lengths...