James Jason Mecir (born May 16, 1970) is an American former Major League Baseball pitcher who played for five teams over an 11-year career between 1995 and 2005. Mecir is notable for having overcome a birth defect (namely club feet) to become an effective Major League pitcher as well as for regularly throwing a screwball. He spent 4+1⁄2 years as a member of the Oakland Athletics and is prominently mentioned in Michael Lewis's bestselling book Moneyball: The Art of Winning an Unfair Game.