The 2005 United States Open Championship was the 105th U.S. Open, held June 16–19 at Pinehurst Resort Course No. 2 in Pinehurst, North Carolina.Michael Campbell won his only major title in a surprising collapse by two of the best players in the world.It was the second of three U.S. Opens at the course, which first hosted in 1999, when Payne Stewart won his second U.S. Open four months before his death in an aviation accident. Six years was the shortest gap between U.S.