 Coming out of 2007 spring training, Chico had made the club's starting rotation, and he made his major league debut on April 4, 2007, at RFK Stadium versus the Florida Marlins.His first major league win came on April 16, in a Nats 5-1 victory over the Atlanta Braves.Chico got off to a rocky start, on a cold and bitterly windy night, walking the bases loaded in the first inning, but escaping unscathed.