Martin Kaymer shot a 2-under 70 on Saturday to grab a 1-stroke lead after three rounds of the Nedbank Golf Challenge.
Kaymer sits a 5-under 211 through 54 holes -- one shot clear of Louis Oosthuizen, who fired a 69 on Saturday to take sole possession of second place.
"I just played very solid -- I hit a lot of fairways again and hit a lot of good putts," said Kaymer. "I also had a lot of lip-outs, so it could have been a little bit better, but 2-under par is a very acceptable round."
Charl Schwartzel carded a third-round 70. He is alone in third at minus-3, while Bill Haas (71) and defending champion Lee Westwood (70) are knotted in fourth place at 2-under.
Overnight leader Paul Lawrie stumbled to a 75 at Gary Player Country Club on Saturday. He is in sixth place at 1-under.
Peter Hanson (73) is alone in seventh at 2-over, Francesco Molinari (78), Carl Pettersson (74) and world No. 4 Justin Rose (69) are tied for eighth at 5- over, Nicolas Colsaerts (74) is in 11th place at 6-over and Garth Mulroy (75) rounds out the 12-player field at plus-7.
Lawrie entered Saturday with a 1-shot lead, but that advantage disappeared on the first hole.
There, the 1999 British Open champion overhit his second shot and eventually settled for bogey, while Kaymer tapped home a short putt for par and a share of the lead.
In all, Lawrie bogeyed three of his first five holes, leaving Kaymer, Oosthuizen, and Schwartzel to battle for the top spot down the stretch.
Kaymer birdied the ninth to claim a 1-stroke lead at the turn, but Oosthuizen responded with a birdie on the par-5 16th to join the German at 4-under, with Schwartzel lagging close behind.
Oosthuizen, though, closed with pair of pars, and Kaymer moved in front for good when he birdied No. 14 to reach 5-under. He then rattled off four straight pars to maintain the 1-stroke advantage entering the final day.
"Tomorrow I can't see anyone shooting a 66 or a 65 to win it -- the course is just playing really tough," said Oosthuizen. "Martin is leading on 5-under, so you're looking seven or 8-under maybe. Tomorrow I just need to stay patient and give myself a shot with four or five holes to go."
NOTES: Only seven of the 12 players in the field have competed in this event before ... In the eight-player Champions Challenge, Bernhard Langer shot a final-round 74 and claimed the title by two strokes over Jay Haas.