LUSS, Scotland—Graeme McDowell won the Scottish Open with three straight birdies on the back nine for a 3-under 68 and a two-stroke victory Sunday.

Phil Mickelson had a 73 and finished 11 shots off the lead in a tie for 38th.

McDowell trailed Simon Khan by two shots until Khan double bogeyed the 12th. McDowell then birdied the next three holes to move ahead and went on to win with a total of 13-under 271 at Loch Lomond.

James Kingston (66) finished second. Richard Green and Miguel-Angel Jimenez shot 69s to tie for third at 274. Khan had a 72 to finish fifth, another stroke back, but secured a spot for the British Open that starts Thursday at Royal Birkdale.

Ernie Els (69) tied for ninth.

Mickelson knows he has work to do before the British Open.

“I had a great week this week even though I didn’t play the way I wanted to,” Mickelson said. “I had three good days at Birkdale before this tournament. So this gives me the opportunity to look at some of the strengths I had here as well as the weaknesses, and see if I can put it all together for this week.

“I’ll spend most of my time on the short game. I turned that around a little today, but overall for me the whole week, it wasn’t what I was expecting. I wasn’t pleased with the way I chipped or putted this week.”

McDowell has now almost certainly clinched a debut appearance in the Ryder Cup at Valhalla in September.