Motivated Spieth out to tame Day

If the first half of 2015 belonged to Jordan Spieth, the second half has been Jason Day's – and Spieth is determined to end the Australian's run.

Frequently paired together in recent months, Spieth has had a front row seat as Day has won four of his last six tournaments, including his maiden major title at the PGA Championship.

Spieth admits that Day has "destroyed" him during that period, and he's ready to turn the tables heading into this week's Tour Championship.

"Five of my last seven rounds were (played) with Jason and some of the biggest rounds of the year," said Spieth. "He destroyed my score in those rounds, for lack of a better term. 

"It is very motivating. It makes me want to get back to the level I was playing at this whole year, to get on top of my game and see if the top of my game can beat the top of anybody else's game when they're at their best."

The 22-year-old has enjoyed a year to remember, claiming his first major title at the Masters, before going on to add a second at the U.S. Open. In addition, Spieth also triumphed at the Valspar Championship and the John Deere Classic, and he briefly held the number one ranking before being surpassed by Rory McIlroy, who has since lost top spot to Day.

Despite this success, Spieth is far from satisfied, and has said that he will be treating this week's event at East Lake, and next month's Presidents Cup like majors as he looks to round off the season in style.

"I've got enough strength left, I've got enough mental strength left," he said. "I really want to peak these next two tournaments."