Apr 6, 2015; Phoenix, AZ, USA; Chalk flies as San Francisco Giants pitcher Madison Bumgarner uses a rosin bag on the pitchers mound in the first inning against the Arizona Diamondbacks during opening day at Chase Field.
via http://aroundthefoghorn.com/2015/04/11/san-francisco-giants-take-pounding-from-padres-lose-mcgehee/
