EDMOND, Okla. — Colin Montgomerie won a three-hole playoff against Gene Sauers to win the U.S. Senior Open title Sunday at Oak Tree National.

Both finished regulation at 5 under. Montgomerie entered the third extra hole with a one-shot lead, then made a putt on No. 18 to par the hole and claim the win.

Montgomerie became the fifth golfer to win both the Senior PGA Championship and U.S. Senior Open in the same year. He led at the end of the first and second days of the Senior Open, but entered the final round four shots behind Sauers and shot a 2-under 69 to force the playoff.

It was the first playoff at a U.S. Senior Open since 2002, when Don Pooley beat Tom Watson in a five-hole playoff.

PGA TOUR: Brian Harman used three straight birdies down the stretch to hold off Zach Johnson by one stroke and win the John Deere Classic for his first PGA Tour title.

Harman had a 5-under 66 in the final round for a 22-under-262 total. The 27-year-old Georgian in his third full season on the PGA Tour earned $846,000 and the last exemption for next week’s British Open.

Harman withstood Johnson’s challenge by making three birdies beginning at No. 14 to get to 23 under with two holes to play. Johnson birdied the 17th to get within a stroke but ran out of holes.

SCOTTISH OPEN: Justin Rose won by two shots at Aberdeen, Scotland, after a final round 6-under 65, sealing back-to-back victories on either side of the Atlantic and bolstering his confidence heading into next week’s British Open.

The 2013 U.S. Open champion turned the last day into a procession, rolling in six birdies and going bogey-free to finish at 16-under 268. Kristoffer Broberg of Sweden finished second after a 66.