The Masters champion Jordan Spieth added another chapter to golf's record books with a nerve-jangling, one-shot victory at the US Open at Chambers Bay in Washington State.
The 21-year-old American sank a curling 28-footer to birdie the 16th and forge three ahead, then shrugged off a double-bogey at the 17th before becoming just the sixth player to slip into a green jacket and hoist the US Open trophy in the same year.
Though Spieth birdied the par-five last to close with a one-under-par 69, he then had to watch as fellow American Dustin Johnson, in the final pairing, had a 12-foot eagle putt to win it at the 18th.
Johnson's putt slid past the cup and he missed a four-foot birdie putt coming back to squander the chance of forcing an 18-hole playoff on Monday at Chambers Bay.
Spieth posted a five-under total of 275 on a challenging links-style layout that firmed up under a baking sun as he became the youngest winner of the US Open since Bobby Jones in 1923.
Spieth, who stunned the golf world with a wire-to-wire victory by four shots at the Masters in April, became the youngest player to win back-to-back majors since Gene Sarazen in 1922.
Johnson, seeking his first major crown, had to settle for a share of second place with South African Louis Oosthuizen, who sensationally birdied six of the last seven holes, including five in a row from the 12th, for a 67.
It was further major heartbreak for the big-hitting Johnson, a nine-times winner on the PGA Tour who came desperately close in his title runs at the US Open and PGA Championship in 2010.