Roy Oswalt is officially scheduled to make his Rockies debut Thursday in D.C. against the Nationals. Oswalt signed a minor league contract with Colorado on May 2 and has registered a stellar 2.16 ERA, 0.93 WHIP and 25/7 K/BB ratio across 33 1/3 innings since reporting to Double-A Tulsa. The veteran right-hander is worth a try in most standard mixed fantasy leagues, though keep in mind that he struggled last year with the Rangers.