Mac Williamson had to dust himself off after crashing into a low padded wall near the stands in left field while chasing a foul ball. More frustrated than hurt, Williamson took it out on Nationals pitcher Tanner Roark a few moments later after undergoing a series of concussion tests in the dugout. Williamson homered for the second straight night and third in five games, hitting a tiebreaking shot in the sixth inning to lead San Francisco to a 4-3 victory over Washington on Tuesday night. read more http://www.espn.com/mlb/recap?gameId=380424126
