The 1980 U.S. Open was the 80th U.S. Open, held June 12–15 at Baltusrol Golf Club in Springfield, New Jersey, west of New York City. Jack Nicklaus set a new tournament scoring record to win his fourth U.S. Open title, two strokes ahead of runner-up Isao Aoki; in fact, as the tournament transpired these two golfers ended up playing all four rounds together. Seve Ballesteros, the reigning champion of the British Open and Masters, was late to the course on Friday, missed his tee time, and was disqualified; he had carded a 75 on Thursday.