Jordan Spieth's second career major title was overshadowed by the manner in which Dustin Johnson lost a shot at his first.

Staring at an eagle putt to win the 115th U.S. on the par-5 18th hole at Chambers Bay, Johnson knocked his first attempt four feet past the hole. His second putt, to force an 18-hole playoff with Spieth Monday, drifted past the left edge of the hole. Spieth finished with a 5-under par 275, one shot ahead of Johnson and Louis Oosthuizen, who shot 29 on his final nine holes of the weekend.

"I'm in shock," Spieth said, who now goes to St. Andrews next month in his pursuit of golf's holy grail -- the calendar Grand Slam. He is the first man to win the Masters and U.S. Open in the same year since Tiger Woods in 2002.

For all the criticism of Chambers Bay, this was theater at its finest.

Spieth looked like he had this wrapped up when he rolled in a 25-foot birdie putt on the 16th hole, turning toward Puget Sound before he pumped his fist. With Branden Grace hitting a tee shot onto the railroad tracks to make double bogey, Spieth had a three-shot lead.

And then it was gone.

He took double bogey on the 17th hole. Oosthuizen made one last birdie -- six of his last seven holes for a 67 -- to post at 4-under 276. Johnson, who had a two-shot lead at the turn until missing so many putts on the back nine, was forgotten.

Spieth, a wire-to-wire winner at Augusta National, showed he can be clutch. He drilled a 3-wood off the back slope to 15 feet and two-putted for his birdie and a 69 to finish at 5-under 275. Johnson, in the final group behind him, made a 4-foot birdie on the 17th and needed a birdie to force a playoff.

He made par.

It was the fourth heartache for Johnson in the majors, and this was the worst.

Spieth was waiting to use the bathroom when Johnson came out. It was an awkward pat on the back. There wasn't much to say.

Jason Day, who collapsed on Friday with vertigo only to rally for a share of the 54-hole lead, fell back with missed putt and was never in the hunt on the back nine. He closed with a 74 to finish five shots behind.

The Associated Press contributed to this report.