American golfer Brooks Koepka claimed the title in the WGC St. Jude Invitational in Memphis on Sunday. The world number one paired with Northern Ireland's Rory McIlroy for the first time in a final round.

Koepka birdied three of the first six holes and fired a bogey-free five-under par 65 to finish on 16-under 264 after 72 holes to win his first World Golf Championship title with a hug from McIlroy.

"I've taken a trip to the hospital. It changed my life," he said. "It puts everything in perspective, how little golf means, how much life matters."

McIlroy started with a one-shot lead, but the four-time major champion slid to joint fourth and left without talking to reporters.

Matthew Fitzpatrick started the day third and the Englishman finished one under 69, ending up tied for fourth.

Marc Leishman, the first Australian to win Rookie of the Year in 2009, finished three rounds to climb to third on the leaderboard.

American Webb Simpson had an eagle and a birdie before he added four more birdies on the back nine to finish at 13-under.

Koepka won the seventh title of his career at 16 under, three strokes ahead of Simpson with Leishman another shot back and alone in third. McIlroy ended up five off the pace while China's Li Haotong tied for 20th at five-under.