U.S. Open - Round One

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A weather warning sign is seen near the first green during Round One... News PhotoArdmore - Pennsylvania,Bestof,Danger,Golf,Green - Golf Course,Merion Golf Club,Round One,Sport,The Majors - Golf,Topics,Topix,US Golf Open,US PGA Tour,USA,Vertical,WeatherPhotographer Collection: Getty Images Sport 2013 Getty ImagesARDMORE, PA - JUNE 13: A weather warning sign is seen near the first green during Round One of the 113th U.S. Open at Merion Golf Club on June 13, 2013 in Ardmore, Pennsylvania. (Photo by Ross Kinnaird/Getty Images)