Scotland's Doug McGuigan hit five birdies to reach four under with three holes left to play.
Only dropping three shots in his last three holes on Saturday was something of an improvement.
With three holes left to play of his second round he was also three-over par.
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Two birdies came in his final three holes, sandwiching his sole bogey on the day.
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After I par the next three holes in succession, my caddy turns a cynical eye toward me.
He played on for another three holes and arrived back at his official residence some three hours later.
Oosthuizen eagled the 15th to draw level but missed chances for an outright win at his last three holes.
Defending champion Jean van de Velde bogeyed two of his last three holes to trail Vancsik by 14 shots.
There was also a moment when 55-year old Bernhard Langer, the 1993 champion, threatened as he birdied the first three holes.
After four early bogeys, Caldwell held his nerve to par his final three holes for a 74 which proved good enough.
Wood set the early clubhouse mark with a round of 68 while Quiros birdied the last three holes for the same total.
But the South African endured a torrid finish to his round, dropping three shots in his final three holes, to post a one-over 72.
Also on 12 under was South African three-time major winner Ernie Els, who led the field on 14 under with just three holes to play.
World No. 1 Martin Kaymer was tied for fifth on nine under with three holes to play, having shot six birdies in an as-yet unblemished scorecard.
The first three holes and eighteen wrap around a large lake in the middle of the spacious property, while there are a few smaller lakes throughout.
Kuchar missed only one fairway and held off a hard-charging Kevin Chappell over the last three holes to close with a 4-under 68 for a two-shot victory.
The youngsters were five up after 11, but nearly threw it away by losing the next three holes, prompting their captain to have a few sharp words.
Poulter had reached seven under in his final round but bogeyed three holes in a row to fall away in his bid for a first major crown.
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After Jeong pulled within three holes on No. 14, the 21-year-old Korean hit his approach shot on the par-4 15th hole to within eight feet of the pin.
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Overnight leader Lara was still ahead with seven to play, but he then bogeyed three holes in a row and Dodd birdied 16 and 17 to take control.
Through the first three holes, the match is all square.
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McGeady had birdied the first and the third but he was soon to drop four shots in three holes after he bogeyed four and five and double bogeyed six.
First-round leader, Northern Ireland teenager Rory McIlroy, was a late starter but dropped back to seven-under alongside India's Jeev Milkha Singh after a bogey during his three holes possible.
The 23-year-old responded with a birdie at 11, and three more at the last three holes to end the day tied for fifth and in sight of pacesetter Billy Horschel.
And Ireland's Padraig Harrington Harrington was two down after 15 holes against Angel Cabrera, only to birdie the final three holes of regulation before winning with a par at the 19th.
The misstep dropped McIlroy to 1 under, but he rebounded with key putts on the final three holes for birdies and pulled well within reach of the leaders entering the weekend.
The Australian, who shared the halfway lead with Perry, jumped clear with two birdies in the first three holes, before the threat of lightning halted play for more than two hours.
Hanson bogeyed two of the first three holes, and Mickelson suffered an excruciating triple bogey on the par-three fourth hole when his tee shot pinged off the spectator railing into a bamboo thicket.
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While he birdied the second and third to improve to 20 under par, nearest challenger McIlroy followed his matching four on the long second with bogeys at two of the next three holes.
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