Published: Dec 02, 2011 4:29 PM EST
Updated: Dec 03, 2011 7:30 AM EST

SUN CITY, South Africa (AP) - Graeme McDowell recovered from a double-bogey seven at No. 14 to birdie two of his last three holes Friday for a 5-under 67 and a one-shot second-round lead at the Nedbank Golf Challenge.

McDowell moved to 7 under for the tournament and ahead of four players, who shared second at Sun City.

American Jason Dufner had four birdies in his 68 to go to 6 under. Robert Karlsson (69), Martin Kaymer (68) and defending champion Lee Westwood (70) were one off the lead with Dufner.

Top-ranked Luke Donald was tied for eighth at 3 under with his 1-under 71 after he bogeyed two of his first four holes.

Overnight co-leader Charl Schwartzel slipped to 10th in the 12-man field with a 2-over 74 at Gary Player Country Club.