Washington Nationals left fielder Bryce Harper (34) and Denard Span (2) celebrate the Nationals' 4-2 win over the Chicago Cubs after a baseball game Tuesday, Aug. 20, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)

Photo by: Charles Rex Arbogast

Washington Nationals left fielder Bryce Harper (34) and Denard Span (2) celebrate the Nationals' 4-2 win over the Chicago Cubs after a baseball game Tuesday, Aug. 20, 2013, in Chicago. (AP Photo/Charles Rex Arbogast)