Washington, US (BBN)-America’s Jordan Spieth added the US Open title to his Masters victory after a thrilling climax at the much-criticised Chambers Bay.

The 21-year-old carded a one-under 69 to win his second major of 2015 by one shot on five under after Dustin Johnson three-putted the last from 12 feet, reports BBC.

South Africa’s Louis Oosthuizen sank six birdies in his last seven holes as he hit 67 to tie Johnson for second.

World number one Rory McIlroy (66) briefly threatened but ended level par.

AN ASTONISHING FINISH

Spieth, the world number two, started the final round in a four-way tie for the lead with Johnson, Branden Grace and Jason Day of Australia.

He bogeyed his opening hole to drop back to three under but twelve pars and two birdies followed to keep the Texan in touch before a three-shot swing on the 16th put him three clear with two to play.

Spieth and playing partner Grace were both five under but the South African, who had played solidly for 15 holes with two birdies and a bogey, inexplicably hit his tee shot out of bounds.

That led to a double-bogey six and he dropped to three under while Spieth drained a 28-foot birdie putt to move to six under.

Johnson, who led by two at one stage after a couple of birdies in a bogey-free opening nine holes, looked to have cracked with three bogeys in four holes dropping him back to three under after 13.

However, Spieth and Johnson were level after the par-three 17th. Spieth found trouble with his tee shot and double-bogeyed while Johnson hit the green and holed his birdie putt.

Both players missed eagle putts on the last but while Spieth kept his nerve to hole his fourth shot, Johnson pushed his attempt wide.

A DAY TOO FAR

The Australian, who shared the overnight lead, never looked comfortable on the final day as he continued to battle the effects of the vertigo that had troubled him since the end of Friday’s round.

He countered three bogeys with two birdies on his front nine but a double-bogey six on the par-four 13th effectively ended his challenge and he ended with a four-over 74 and level par total.

MCILROY AND SCOTT CHARGE

The tone for an extraordinary final day of an extraordinary tournament was set when Northern Ireland’s McIlroy holed six birdies in his opening 13 holes, including an incredible 72-foot putt.

That lifted the 2011 US Open champion from four over to two under but his momentum was halted when he missed a 10-foot birdie putt on the 14th and a six-foot par putt on the 15th.

A further bogey followed on the 17th and he finished with a par five at the last.

“It just wasn’t meant to be, I didn’t play the last few holes well all week,” he told BBC Sport.

“It’s going to take a few days to get over it but when I look back on it I’ll be happy about it – a few missed putts will have made the difference.”

With McIlroy ripping up the course, Australian Scott , who started the day on three over, crept almost unnoticed into contention with four birdies in his opening 11 holes.

The 2013 Masters champion, who finished tied ninth at the US Open last year, birdied the 16th and 18th to set the clubhouse lead at three under.

WONDERFUL OOSTHUIZEN

The South African, who won the 2010 Open, was nine over par early in Friday’s second round but two four-under-par 66s saw him start the final round at one under.

Three consecutive bogeys on the front nine looked to have put him out of contention. However, he played the back nine in just 29 shots, with six birdies in his last seven holes to take the clubhouse lead off Scott.

BBN/SK/AD