The 2013 United States Open Championship was the 113th U.S. Open, held June 13–16 at the East Course of Merion Golf Club in Ardmore, Pennsylvania, west of Philadelphia. Justin Rose won his first major title, two strokes ahead of runners-up Jason Day and Phil Mickelson. U.S. Open 2013: June 13–16, 2013 at Merion Golf Club East Course. Champion: Justin Rose, at 281 (+1). Wiki link