Masters champion Jordan Spieth is keeping the grand slam dream alive as he holds a share of the lead late in the final round of the US Open at Chambers Bay.
Spieth is one-under through 15 holes to be tied with playing partner Branden Grace, who is also one-under to be five under overall.
They hold a two-shot buffer over Australian Adam Scott, South African Louis Oosthuizen and American Dustin Johnson at three-under.
Former world No.1 Scott has likely left it too late despite taking the early clubhouse lead following a flawless six-under 64.
The 2013 Masters champion put together the round of the tournament so far in a stunning surge, the second equal best in final round US Open history.
Oosthuizen has two holes remaining and Johnson four holes to play.
Scott birdied three holes on each side of the course to at least throw the cat among the pigeons as the leaders try to battle through the back nine.
Jason Day has fallen off the pace and continues to struggle with his vertigo issues.
After starting in a tie for the lead Day has dropped four shots in 14 holes to be even par overall, now five shots off the lead in a tie for 10th.
Day is playing with his trainer and a vertigo specialist in close proximity as he continues to try to recover from Friday’s episode where he collapsed on his final hole.
He has needed help up and down out of bunkers and looks fatigued with heavy breathing.
He bogeyed the fourth hole after a terrible three-putt where his first putt away from the hole stayed above a huge ridge and while he bounced back with a birdie on the fifth, back-to-back bogeys on six and seven halted his run.
The Queenslander had a chance to turn the momentum after a birdie on the eighth and a great tee shot on the par-three ninth but he missed the short chance.
Bogeys on 10 and 13 killed off his chances.
Major Championship rookie Cameron Smith is still holding his own in exalted company, even through his opening 16 holes to be one-under-par in a tie for seventh.
He is flirting with a potential conditional PGA tour card.
John Senden posted a two-under-68 to move to two-over for the week, currently tied 14th, Geoff Ogilvy shot 67 to be three-over and tied 18th while Marcus Fraser finished at 13 over.