WASHINGTON - Jayson Werth belted a ninth-inning, walk-off home run to lift the Washington Nationals to a 2-1 victory on Thursday and force a winner-take-all showdown in the best-of-five National League Division Series. Werth capped his lengthy plate appearance by lining a shot of reliever Lance Lynn into the Cardinals bullpen in left field. Washington will host the Cardinals on Friday for the right to face the San Francisco Giants in the best-of-seven National League Championship Series. Adam LaRoche, who entered the game batting . ...