Mickelson on charge as McIlroy crumbles
Phil Mickelson burst into a share of the lead as Rory McIlroy suffered a collapse almost as bad as last year's on a dramatic day at The Masters.
A year after playing the last nine holes in 43 and signing for an 80, McIlroy went to the turn in 42 with two double bogeys and two bogeys.
From joint third overnight and only one off the lead, he crashed to joint 34th place and that became 38th when he bogeyed the 11th to be nine shots back.
In stark contrast, Mickelson birdied the 10th and 12th and then holed a curling 25-foot eagle putt at the next to join fellow American Matt Kuchar, Swede Peter Hanson and South Africa's 2010 Open champion Louis Oosthuizen on six under par.
Lee Westwood had been one of the seven players to have at least a share of top spot in the third round - that was when he birdied the long second - but in his 56th attempt to win a major he failed to get up and down from sand on the seventh and then missed a par putt of little more than a foot at the ninth. He had putted for birdie from only 10 feet moments before.
That gave Westwood a front-nine 37 and at joint ninth on three under he was still very much part of the title race, as was Padraig Harrington, who birdied five of the last six holes for a joint best-of-the-day 68 for four under.
Scot Paul Lawrie was three under with seven holes remaining, but 52-year-old Fred Couples, joint halfway leader with Jason Dufner, managed only 39 for the outward half to stand two under.