McIlroy: Today will be tougher

Rory McIlroy is expecting a tough test at the USPGA Championship today despite being just one shot off the lead at Kiawah Island.

One behind US-based Swede Carl Pettersson after starting the USPGA Championship - golf's final Major of the year - with a five-under-par 67, McIlroy was in no mood to make any bold predictions.