HONG KONG (AFP) - Rory McIlroy said he was struggling with mental and physical tiredness after he fell off the lead in the third round of the US$2.75 million UBS Hong Kong Open on Saturday. McIlroy had kept pace with Alvaro Quiros over the first two days of the event, but the Spaniard fired a sparkling three-under 67 to take a one-stroke lead, while the Northern Irishman slipped three strokes behind. "I just didn't have anything out there," said McIlroy, who sits at seven under for the event. Picking up the pace behind Quiros instead were Sweden's Peter Hanson, who fired a five-under 65 for a three-round total of nine-under, and both South Korean Major winner Y.E Yang and Thailand's Pariya Junhasavasdikul, who shot 65 and 67 respectively and are poised at eight-under. McIlroy revealed on Friday he had not fully recovered from a virus picked up while on holiday in the Maldives last month with girlfriend and world number one tennis player Caroline Wozniacki. He still hit par but left the course far from happy. "Going out on the golf course I noticed little things start agitating me and you hear cameras you don't usually hear," said the 22-year-old. "It's just a sign that I'm a little tired. I need to go back and rest up and put everything in to tomorrow. But I'm only three behind so it's not like I'm out of it myself." The long-hitting Quiros has told everyone who will listen this week that the tight Hong Kong Golf Club course doesn't suit his game. "After tomorrow I'll tell you if I feel comfortable here or not," said the 28-year-old.