World Golf Championships-Bridgestone Invitational - Final Round

Rory McIlroy holds the Gary Player Cup trophy after winning the World Golf Championships-Bridgestone Invitational with a score of -15 during the final round. (Sam Greenwood / Getty Images / August 3, 2014)

AKRON, Ohio -- Rory McIlroy birdied four of the first five holes on Sunday to grab the lead, and he went on to win the WGC-Bridgestone Invitational by two strokes.

McIlroy closed with his second straight 4-under 66 to end at 15-under-par 265. The win will move the Open Champion back to the No. 1 spot in the world rankings on Monday.

Third-round leader Sergio Garcia was unable to get anything going in the final round. He carded a 1-over 71 and ended alone in second place at minus-13 at Firestone Country Club.

Marc Leishman shot 3-under 67 and ended in third at 12-under 268. Justin Rose (69), Charl Schwartzel (64), 2012 winner Keegan Bradley (69) and Patrick Reed (65) shared fourth place at minus-9.

Adam Scott, the 2011 champion, bogeyed three in a row on the back nine to fall out of the top five. He managed a 1-over 71, which left him tied for eighth at 7-under-par 273. By finishing outside the top five, Scott will lose his spot atop the world golf rankings on Monday.

The 2013 Masters champion was joined at minus-7 by Graeme McDowell (66), Ryan Moore (67) and Rickie Fowler (67).