* McIlroy tests ankle in practice round
* Aims to defend his PGA Championship title (Adds detail)
Aug 8 (Reuters) - World number one Rory McIlroy arrived at Whistling Straits for a practice round on Saturday as he bids to return to competitive golf from an ankle injury and defend his PGA Championship title at the links-style venue next week.
Reuters exclusively reported on Monday that the four-times major champion had scheduled a practice round at the site for Saturday, a report that turned out to be accurate even though it was denied by the golfer's publicist.