Abu Dhabi: Two days before Rory McIlroy tees off his campaign at the Abu Dhabi HSBC Golf Championship, it is not the pressure of being world number one that gives him sleepless nights but his girlfriend’s schedule at the Australian Open in Melbourne.

Caroline Wozniacki took three sets to dispose of Germany’s Sabine Lisicki at the Australian Open in Melbourne and McIlroy had to sleep late on Monday night to see his other half in action.

The Irishman admitted his loss of sleep early yesterday morning after Wozniacki 2-6, 6-3, 6-3, and said in zest: “No, she likes playing three sets.”

“It’s fine. I’ve done it plenty of weeks before. It’s something that I’m used to,” he said.

“Even if I try to get some sleep and she is playing, I won’t be able to sleep because all I’ll be able to do is thinking about how she’s doing and checking the phone and check the score. So I may as well watch it and put myself out of my misery a bit,” McIlroy said.

Wozniacki, who finished 2010 and 2011 as the world’s top-ranked player, has slid to No. 10 in the rankings as she opens her 2013 campaign bidding to win her first ever Grand Slam.