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18 AUGUST 2015: Washington Nationals right fielder Bryce Harper (34) pats Colorado Rockies third baseman Nolan Arenado (28) on the rear after Arenado doubled during a regular season Major League Baseball game between the Washington Nationals and the Colorado Rockies at Coors Field in Denver, Colorado. *****For Editorial Use Only***** (Photo by Dustin Bradford/Icon Sportswire/Corbis/Icon Sportswire via Getty Images)

18 AUGUST 2015: Washington Nationals right fielder Bryce Harper (34) pats Colorado Rockies third baseman Nolan Arenado (28) on the rear after Arenado doubled during a regular season Major League Baseball game between the Washington Nationals and the Colorado Rockies at Coors Field in Denver, Colorado. *****For Editorial Use Only***** (Photo by Dustin Bradford/Icon Sportswire/Corbis/Icon Sportswire via Getty Images)