Sergio Garcia continued his remarkable recent run of form as he opened up a two-shot lead heading into the final round of the Nedbank Golf Challenge in South Africa.
Two-time victor Garcia leads the way by four shots after posting a superb eight-under 64 at the Gary Player Country Club, registering eight birdies in his bogey-free round.
Garcia began with successive birdies, and picked up further shots on the par-four sixth, the par-five ninth and par-five 14th, but missed a short putt for par on the fifth, three-putted the 13th for a bogey and then dropped another shot on the 18th hole as his second putt horseshoed back at him. Oosthuizen, who is from South Africa, has never won his country's most prestigious tournament.
Rory McIlroy is a man on a mission at the Nedbank Golf Challenge this week as he looks to mount a late charge for a fourth Race to Dubai title.
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"It's nice, but it's still the first day", he said. "It doesn't work like that".
"My thing is I'm coming here with the goal, if I can get into that final group on Thursday with Frankie next week, that would be a good start", McIlroy said, conscious that he's played in six final groups this year without success.
Oosthuizen's second round gave the 2010 Open champion the chance of a first tournament win since February 2016.
The Spaniard responded by holing a 15-footer at the next and making another from a similar distance at the ninth to reach the turn three ahead, only for Ross Fisher to cut the gap to two after following a front-nine 31 with three birdies in four holes from the 11th. First, the Englishman sent his tee shot way left and the ball was trapped under a dead tree, which he would have been allowed to move if he had been able to lift it. He was on the green in six and three-putted for a nine on the par 4.
Garcia led by four strokes at the start of the day, but that advantage was cut to just one as South African Louis Oosthuizen fired a second-round 67 to climb to eight-under overall.