$ 0 0 Bubba Watson was rewarded for his impressive early season form when he stormed to his first PGA Tour title since the 2012 Masters with a two-shot victory at the Northern Trust Open on Sunday. Four strokes off the pace going into the final round, the American left-hander seized control with five birdies in the first eight holes on the way to a flawless seven-under-par 64 at a sun-splashed Riviera Country Club.Watson, who has long relished playing at the revered venue despite never having posted a top-10 finish in seven previous starts, finished up in style as he rolled in a 14-foot birdie putt at the last to post a 15-under total of 269.Watson came into the tournament having recorded two top-10s in his first four starts on the 2013-14 PGA Tour, his best finish a tie for second at the Phoenix Open earlier this month. Long-hitting American Dustin Johnson, one of four players who held at least a share of the lead during the final round at Riviera, closed with a five-birdie 66 to finish alone in second. Monday qualifier Jason Allred and fellow American Brian Harman signed off with 68s to share third place at 12 under, a stroke better than 2011 Masters champion Charl Schwartzel of South Africa, who also carded a 68.