Karlsson recovered from a bogey at the first to take the lead

Robert Karlsson moved into a four-shot lead at the PGA Championship as second-round leader Paul McGinley had a torrid time in windy conditions.

The Swede holed four birdies and an eagle at Wentworth to move to 11 under par with a round of 70.

Irishman McGinley, who held the lead after the first two rounds, slid back to joint fourth after sinking seven bogeys and a double-bogey in a 79.

Miguel Angel Jimenez and Oliver Wilson were tied for second on seven under.

"It was a testing day," Karlsson told BBC Sport. "I just tried to do what I'm best at, focus and keep going.

"When Paul got off to a poor start it was important that I did not get caught up in that.

"Now I'll either come out a winner or a stronger man on the final day so either way it's good. It is another 18 holes and that's all I'm focused on."

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Playing partners Karlsson and McGinley both got off to tricky starts at the West Course with Karlsson sinking a bogey and McGinley dropping two shots.

But the 38-year-old Swede recovered to reach the turn on a level-par 35 before eagling the 12th after getting to within 10 feet of the hole with two brilliant shots.

Karlsson matched two bogeys with two birdies on the back nine to move from four behind McGinley to four ahead of him after day three.

McGinley compounded his problems after his opening double-bogey, ultimately missing a par-putt at the last to slump to 79 - his worst total of 2008.

That miss also saw him drop back from a share of second to lie joint fourth with Argentina's Daniel Vancsik and Indian Jyoti Randhawa.

"It's a long way back for me now because today was a real body blow," McGinley said.

The game was tough on me - it didn't give me anything back Paul McGinley

"I had an horrendous start and I didn't get any momentum at any stage. The game was tough on me - it didn't give me anything back.

"The conditions asked a lot of questions and I wasn't able to produce the answers. I'm shattered at the moment because that's taken a lot out of me."

Spain's Jimenez birdied the final two holes to stay in contention alongside Wilson, who keeps alive his hopes of a first Tour title.

Only three players broke 70 as strong winds gusted across Wentworth, the lowest round a 68 by Argentina's Rafa Echenique, who is tied for seventh.

Randhawa lifted himself into contention with a 69 that included five birdies while England's Oliver Fisher also carded 69 to move to three under.