Rory McIlroy

Rory McIlroy claimed back-to-back PGA titles at the BMW Championship on Sunday to consolidate his world number one ranking as Australian Adam Scott finished four strokes off the pace.

Just a week after holding off Louis Oosthuizen and Tiger Woods at the Deutsche Bank Championship, the Northern Irishman held off a star-studded field to win by two strokes at a soggy Crooked Stick Golf Club in Indiana.

Scott finished with a two-under 70 to finish at 16 under in a tie for sixth.

McIlroy finished at 20-under-par to defeat playing partner Lee Westwood and Phil Mickelson by two shots, becoming the first player since Woods in 2009 to win PGA Tour events in consecutive weeks.

In blustery conditions, McIlroy's five-under 67 stood out and earned him a third win in four starts after starting the day one shot behind overnight leaders Mickelson and Vijay Singh.

England's Westwood carded a 69 and Mickelson a 70, but it was the former's bogey on the 14th that put McIlroy into the outright lead, as he parred the same hole.

Woods put together another impressive round with four birdies and no bogeys in the last 11 holes, but settled for a share of fourth at 17 under with American Robert Garrigus (69) after closing with a 70.

Scott alternated bogeys and birdies on first six holes and finished strongly with another three from the seventh hole.

The world number six tied with Dustin Johnson for his 11th top-20 finish of the season.

Signh fell away in the final round with a 73 that dropped him off the pace and was one shot ahead of Jim Furyk among a top ten littered with the game's best players.

Of the other Australians, Greg Chalmers finished with a flurry after a final-round 66 took him to 10 under overall.

Geoff Ogilvy closed his round as he started it, with a 68, to move up to seven under.

John Senden was at even par after a 73 and Marc Leishman finished at four over.