Rory McIlroy admits he has been surprised by his level of performance at Wentworth this week, particularly considering the difficult circumstances surrounding him in the build-up to the BMW PGA Championship.

The 25-year-old announced the breakup of his engagement with Danish tennis star Caroline Wozniacki on Wednesday morning, and conceded that he would find it challenging to concentrate on his golf during the European Tour's flagship event in Surrey.

However, the Northern Irishman returned to the clubhouse on Day Two in a strong position - easily making the cut - having carded an impressive five-under-par 139 after 36 holes.

"In a way, yes [I have surprised myself], but I think once you get inside the ropes you're concentrating on your golf, and it's almost like it's a nice four or five hours of, you know, it's like a release in some way just to get everything out of your head apart from doing the job at hand," said McIlroy.

"So it's nice. It's the hours in the day when you're away from it that are probably a little bit more difficult."

After shooting four under in his opening round, McIlroy made a slow start on Friday morning when he bogeyed two of the first three holes. He responded with a birdie at four, but after a double bogey on the par four seventh he hit the turn three over par for the day.

An eagle at 12 for the second consecutive day provided the world number ten with fresh impetus on the back nine, and further birdies at 15, 16 and 18 meant he finished on one under for the day.

"Standing on the 10th tee my goal was to get back to even par for the day," he added. "I thought that would have been good, and I was able to go one better.

"Five-under par going into the weekend, when the conditions are pretty tricky is a good effort, and I stood here yesterday saying that I would be happy to make the cut. I'm in for the weekend which is nice. Hopefully I can make a run at it."

PGA Championships
Rory McIlroy