|Nedbank Golf Challenge round two leaderboard|
|-11 H Stenson (Swe); -10 J van Zyl (SA); -9 R Streb (US); -8 M Leishman (Aus)|
|Selected others: -4 R Fisher (Eng); -3 C Wood (Eng); -2 MA Jimenez (Spa), L Oosthuizen (SA), B Grace (SA), A Sullivan (Eng), D Willett (Eng)|
Five birdies on the back nine give Sweden's Henrik Stenson a one-shot lead on 11-under-par heading into the weekend of the Nedbank Golf Challenge.
Stenson, 39, bogeyed the sixth, seventh and eighth, but turned things around to card a second-round 67 in South Africa.
Jaco van Zyl, joint first-round leader with Stenson at Gary Player Country Club in Sun City, shot 68.
England's Ross Fisher is the best-placed Briton in sixth, seven shots behind Stenson on four under.
Chris Wood is a stroke behind compatriot Fisher on three under, but fellow Englishman Danny Willett, who was third overnight, carded a 75 to drop nine places on a two-under halfway total.
Former world number one and two-time Nedbank champion Lee Westwood is back in 28th after shooting a nine-over 81 that included a triple bogey and a double bogey.
Stenson is surprised to be leading having spent most of the early part of the week in bed with flu.
The Ryder Cup player said: "On Wednesday afternoon I didn't think I would be able to tee it up.
"I thought I was done and dusted, so to be leading after two days, it's a turnaround to say the least. But the saying is 'beware of the injured or sick golfer' and I guess that's true."