Paul Casey is on course to become the first golfer in a decade to complete a double in top European tournaments at Wentworth.
Not since Colin Montgomerie in 1999 has any player won both the BMW PGA Championship and the World Matchplay title at the Surrey venue.
Casey, who won the Matchplay in 2006 with a record 10-and-eight winning margin over Shaun Micheel, goes into tomorrow's final round of this year's PGA Championship with a three-shot lead over Dane Soren Kjeldsen.
A shot further back from the Dane is young Irishman Rory McIlroy, who, if he should triumph at the age of 20 years and 20 days, would be the youngest ever PGA Championship title winner.
McIlroy shot a stunning seven-under-par 65 to move to nine-under and afterwards revealed he had curbed his natural aggression to work his way into contention.
"I just tried to put the ball on the fairways and not be too aggressive off the tee," he said. "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."
Should McIlroy succeed in adding to his debut tour victory at the Dubai Desert Classic in January he will move into the world's top 10 when the latest world rankings are published on Monday morning.
Montgomerie, earlier in the day, looked likely to be one of the players who would chase him all the way but he faded badly at the end of his third-round 69, posting three birdies in four holes on the back nine.
Casey, who has already won on the European Tour in Abu Dhabi earlier this year and recently recorded his first US PGA Tour victory in the Houston Open, will move to third in the world behind Tiger Woods and Phil Mickelson should he win the £750,000 (€852,905) first prize tomorrow.
"I am hitting the golf ball where I want to," said Casey, who would have led by five had he not missed two short birdie putts on the last two par-fives.
"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 world 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."
Kjeldsen is also a man in top form having recently won the Andalusian Open and climbed to 45 in the world rankings.
He completed a third-round 68 with a magnificent birdie at the 18th, playing an awkward bunker shot and then sinking a 25-foot birdie putt.