Adam Wainwright won his major league-leading 16th game and Albert Pujols had the go-ahead hit in the sixth inning, helping the St. Louis Cardinals complete a three-game sweep of the Washington Nationals with a 2-1 victory on Sunday. Colby Rasmus had two hits and scored twice for the NL Central leaders, who have won five of six and are 29-4 since July 1 in starts by their top three — Wainwright,…