THIRD ROUND LEADERBOARD (GB & Ire unless stated):
-13 P Casey -10 S Kjeldsen (Den) -9 R McIlroy -8 R Fisher, C Schwartzel (SA) -7 S Dodd, T Levet (Fr), M Warren -6 A Wall
Selected others: -5 C Montgomerie -4 MA Jimenez (Sp), D Horsey Level E Els (SA) +1 L Donald +2 D Howell, JM Olazabal (Sp) +3 D Clarke
Highlights - PGA Championship day 3 (UK users only)
England's Paul Casey stretched his lead to three shots on day three of the PGA Championship at Wentworth - despite a strong challenge from Rory McIlroy.
Northern Ireland's McIlroy secured the early clubhouse lead with the best round of the day, a seven-under-par 65.
But five birdies helped Casey fire a 67 to improve his score to 13 under par.
Denmark's Soren Kjeldsen is 10 under after a 68, one shot ahead of McIlroy, who leads England's Ross Fisher and South African Charl Schwartzel by one.
McIlroy began the day six shots behind Casey, who won the World Matchplay title at Wentworth in 2006, but fired five birdies on the back nine holes.
With 64 world ranking points available this week, it's a big priz
However, Casey picked up four shots in the first 10 holes of his third round to move to 11 under par, and finished the final five holes in level par - having dropped two shots there on Friday.
However, he did miss two birdie putts on the last two par fives which would have extended his lead even further.
The Cheltenham-born player, who recently recorded his first win on the US tour, will move to number three in the world rankings if he can close out victory on Sunday.
"I am hitting the golf ball where I want to," said Casey.
"It's nice that all the hard work I have put in this year with my coach is starting to pay off.
"And if I could win and move up to third in the rankings that would be great. It's one thing I have been focusing on a lot this year - trying to accumulate as many ranking points as possible - and with 64 of them available this week, it's a big prize."
Meanwhile, McIlroy revealed he had curbed some of his natural aggression to stay in contention.
"I just tried to put the ball on the fairways and not be too aggressive off the tee," he explained.
"I do like to get the ball as close to the green as possible off the tee. But there are some times when you can't do it."
European Ryder Cup captain Colin Montgomerie was tied for second at one point, but slipped back to five under.
Bogies at the 13th, 15th and 16th holes pushed the Scot adrift of the leaders.
Kjeldsen had been tied for second place at the halfway stage with Scotland's Marc Warren and England's Anthony Wall, who remain in the hunt at seven and six under respectively.
Also tied for second as day three began were defending champion Miguel Angel Jimenez and David Horsey, but both fell back to four under.