Defending champion Matteo Manassero of Italy and seventh-ranked Martin Kaymer of Germany both shot two under par rounds of 70 to stay in contention.
The Ulsterman, who needs a top three finish at the 'Earth' course in Dubai to stand any chance of overtaking Germany's Kaymer, finished the day well adrift of the leading pack despite moving to two under par after shooting his lowest round of the tournament.
But an exciting weekend is guaranteed with 16 players within three shots of Couples and Dufner, including Phil Mickelson whose four-under par 68 lifted him to two-under par.
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America's Jim Furyk, Ricky Fowler and Steve Stricker are currently tied for ninth at two-under par alongside England's Lee Westwood and two-time champion, Germany's Bernhard Langer.
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Defending champion Bubba Watson posted a two-under par round of 70 -- his best round of the week -- to leave him in a tie for 28th on two-over par.
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Rose hit three birdies and a bogey as he shot a two-under-par round of 68 to go 16 under after three rounds.
One off the pace at the start of the day, the 32-year-old from Ohio fired a two-under-par 68 to finish on 12 under.
Westwood, who carded a two-under-par 70 at Kingsbarns to lie four off the lead, would usurp Tiger Woods as world number one with a top-two finish.
Canada's number one Mike Weir hit a two-under-par 69, recovering from a bogey on the par-five 14th to string together four straight birdies on the front nine.
Jimenez, who was one of Jose Maria Olazabal's vice-captains in Europe's Ryder Cup victory in September, carded two-under-par 68 to join Campbell on 10-under 200 overall in a tournament he won in 2004 and 2007.
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But a birdie at the final hole ensured the 32-year-old finished two clear on 12-under par.
The American's third round 67 leaves him on 17-under par, two shots clear of Canada's Graham DeLaet and three clear of America's John Rollins (69) and South Africa's Ernie Els (68).
Masters champion Bubba Watson, who is playing his first tournament since clinching the Green Jacket, produced a sparkling round of 65 to move up into a tie for 16th place on nine-under par after two opening rounds of 71.
The 42-year-old American opened with a disappointing one-over 73 but has charged through the field by playing the next two rounds in 15-under-par.
Snedeker fired a final round 65 -- better than all his nearest competitors -- as he ended on 19-under-par, two shots clear of fellow countryman Chris Kirk.
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On Sunday, Mr. Kinzler vanquished his first two opponents, shooting his customary 27 under par for 18 holes.
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He finished on nine under par to win by two strokes from overnight leader Jose Manuel Lara and Anthony Wall.
Two Paul Warwick penalties were all under-par Munster could manage.
The Briton, who claimed a course record 12-under-par 60 on Thursday, holed seven birdies and two bogeys to finish the round on 17 under.
Blixt has played 10 holes over two days in these conditions in 1-under par.
On Thursday, Perez set a PGA Tour two-round record of 20-under-par 124 after following his opening 11-under 61 with a nine-under 63 in California.
Steve Stricker, plodded his way around Augusta more methodically to end up in the same place as Johnson after two rounds is, stands one- under-par.
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Geoff Ogilvy of Australia, who finished second at last year's Johnnie Walker Classic, was in second place again, two shots behind Woods at 9-under-par, as was Wayne Ogilvy, also of Australia.
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Englishman Ross Fisher shot a 69 and Scotland's Richie Ramsay a 71 as they joined Ernie Els in a tie for fourth place on eight under par, with Padraig Harrington two further back and England's Paul Casey moving up to five under with a 67.
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He was able to drop by the green, however, and two-putted for par, and a 12 under par total of 204.
Woods carded a second consecutive five-under-par 67 to join overnight leader Nick Watney (70) on 10-under-par, with world number two Phil Mickelson returning a 66 to lie a shot behind alongside compatriot Ryan Moore and Spain's Alvaro Quiros.
But tellingly, he scored the same on both nines, two birdies and no bogeys, for a four-under-par total.
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