U.S. Open - Preview Day 2

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Caddie Keith Sbarbaro walks walks with Dustin Johnson during a... News PhotoArdmore - Pennsylvania,Caddy,Dustin Johnson,Golf,Horizontal,Merion Golf Club,Practice Round,Sport,The Majors - Golf,US Golf Open,US PGA Tour,USA,WalkingPhotographer Collection: Getty Images Sport 2013 Getty ImagesARDMORE, PA - JUNE 11: Caddie Keith Sbarbaro walks walks with Dustin Johnson during a practice round prior to the start of the 113th U.S. Open at Merion Golf Club on June 11, 2013 in Ardmore, Pennsylvania. (Photo by Scott Halleran/Getty Images)