Jordan Spieth has revealed that he feels Rory McIlroy is the "one to fear" ahead of the last Major of the year being played at Quail Hollow this week.

Spieth said he was looking forward to taking McIlroy head on as he seeks to become the youngest player to complete a career Grand Slam by winning this week's PGA Championship.

McIlroy has looked in good touch in practice, absolutely nailing a drive 350 yards on the range, and Spieth knows the Ulsterman is dangerous if he gets his nose in front.

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“He plays so aggressively, and that's what you have to do to win," Spieth said.

"You're going to lose some tournaments because of it, but you're going to win a lot more than playing any other way.

“If you're matched up on Sunday, and you get to choose somebody, you obviously want to be able to play against somebody like Rory who has four Major championships and is one of the top couple most accomplished players in this field.

"But he is one to fear in that position because of what he's capable of doing and how he's going to do it.

“I think it's cool that we've both had the success that we've had at such a young age, and I think the coolest part about it is the question of, what's it going to be like for the next 20, 25 years.

"And that's what is the exciting part when we think about it, too. We're friendly with each other and really want each other to do well because it does push each other, just like all these young players in the game.”

Spieth is still on high having engineered a stunning win at The Open, having held firm under massive pressure when a tee shot went massively awry.

The Texan recovered remarkably to hole for a bogey and limit what could have been significant damage, but insists he is under no added pressure to add the PGA to his trophy cabinet.

“Expectations, I really don't feel any. This whole: 'This is a chance to complete the career Grand Slam'. I'm here, so I'm going to go ahead and try. But I believe I'm going to have plenty of chances, and I'm young enough to believe in my abilities that it will happen at some point.

“Do I have to be the youngest? No, I don't feel that kind of pressure. Would it be really cool? Absolutely. And I don't come to a tournament unless I plan on giving it my all in preparation to have a chance and to ultimately close a tournament out."