Swede Henrik Stenson, Australian left-hander Richard Green and Welshman Garry Houston share second place following 67s.
The South African will play Accenture Match Play champion Stenson in the second semi-final.
Henrik Stenson, leading the tournament as he stood on the tee Thursday, quadruple-bogeyed 18.
Interestingly, both Sunneson and her current boss, golfer Henrick Stenson, are Swedish, as is the former Mrs.
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Sweden's Henrik Stenson holds a one-shot advantage going into the final round after his 71 on Saturday.
He split the middle, found the green and two-putted for par to join Stenson in the clubhouse lead.
Ryder Cup stars Sergio Garcia, Henrik Stenson and Lee Westwood are just one off the lead on two under.
Campbell cruised to a 65 to join Sweden's Henrik Stenson on seven under, with three players a shot back.
World number 13, Henrik Stenson of Sweden, had a dismal day on the Nick Faldo-designed course carding a 73.
England's David Howell and Luke Donald shot a 63 to share second with Sweden's Henrik Stenson and Niclas Fasth.
Defending champion Henrik Stenson is one shot behind after recovering from two bogeys on his first and second holes.
Stenson's long driving also gave him a huge advantage and earned him a stunning eagle at the par-five 18th.
Dubai resident Stenson shot a bogey-free seven-under 65 to lead on 11-under 133.
Fellow Ryder Cup hopeful Henrik Stenson had a double-bogey five at the second but claimed four birdies for a 70.
It took him two chips to reach the green and he made bogey, and Stenson made another bogey on the 15th.
Points closed with a 6-under 66, the final putt helping him avoid a playoff with Masters-bound Henrik Stenson and Billy Horschel.
World number three Ernie Els, Henrik Stenson, Luke Donald, Lee Westwood and ninth-ranked Vijay Singh are also among the strong field.
Stenson is currently 59th in the Race to Dubai, with only the top 60 qualifying for the final event of the season.
Spain's Gonzalo Fernandez-Castano, European Tour rookie of the year in 2005, was in second place behind Stenson after a round of 69.
"It was a grinding day, " Qatar Masters runner-up Stenson told Press Association.
Poor putting also accounted for eighth-placed Vijay Singh, whose five birdies were offset by two bogeys to leave him seven adrift of Stenson.
"I said to my caddie walking up 18, 'No matter what, we're playing for a green jacket in a couple of weeks, '" Stenson said.
In Beijing Casey will come up against Sweden's Henrik Stenson, the world number 13, who missed the cut on his Masters debut last week.
Fellow Ryder Cup star Lee Westwood was well placed after a 66 for nine-under 134, sharing third spot with Swede Henrik Stenson and Kevin Chappell.
Meanwhile, Swede Henrik Stenson leads at halfway in the South African Open, a co-sanctioned Sunshine and European Tour event, after a 65 for 13-under 131.
"It would be a big bonus if I could win this tournament and be the first one out of Sweden to win it, " said Stenson.
Stenson would become the first male Swedish major champion after the country's success in women's golf with the likes of former world number one Annika Sorenstam.
Oliver Wilson (and Henrik Stenson) coming back from four down against Phil Mickelson (and Anthony Kim) in his debut Ryder Cup match was an incredible result.
Colin Montgomerie, who is vying with Henrik Stenson for top spot in the Ryder Cup rankings, should also do well - he helped design the course.
Several of them were from New York State as were three of our nurses, Laura Ball, from Syracuse, Marie Arsenault, from Schuylerville, and Virginia Stenson, from Brooklyn.
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