Brooks Koepka defeats Rory McIlroy in WGC-FedEx St Jude Invitational

July 29 (UPI) -- World No. 1 Brooks Koepka held off Rory McIlroy to win the WGC-FedEx St Jude Invitational in Memphis.

Koepka shot 16-under for the tournament. He clinched the world golf championships event with a 5-under Sunday.

"It's incredible. To look at what I've done this year, just show consistency, try to take my game to a new level and I've done that," Koepka said.

McIlroy led Koepka by a stroke going into the final round but shot 1-over Sunday. He finished tied for fourth place at 11-under.

"To win this title against Rory was pretty special," Koepka said.

Webb Simpson shot 6-under Sunday to finish in second place. Marc Leishman ended the tournament in third place at 12-under.

Jon Rahm finished in seventh place at 10-under.