6th-Churchill Downs, $123,155, Alw, 5-2, (NW1X), 3yo/up, 7 1/2f, 1:27.44, ft, nose. CASTLEWARDEN (c, 4, Into Mischief--Calm Water, by Empire Maker) hit the board in his first pair of attempts last year, then punched through by 1 1/2 lengths over the Oaklawn slop Mar. 15. The 9-5 second choice tracked a pair of leaders up the backstretch. Castlewarden accelerated around the far turn and took over the lead before the top of the lane. Seemingly in control, favored Classic Legacy (Into Mischief) rallied in the stretch and the pair traded...