Poipu Beach, Hawaii ? Phil Mickelson shot a 59 on Wednesday to win the PGA Grand Slam of Golf, matching the low score in competitive golf.

Mickelson barely missed a 9-foot eagle putt to the left on the last hole that would have given him a 58 at the unofficial event for the year’s major winners. He tapped in for birdie and smiled as the gallery cheered wildly.

Phil Mickelson shades his eyes as his watches his tee shot on the third hole. Mickelson shot a 59 Wednesday in Poipu Beach, Hawaii, to win the Grand Slam of Golf.

Al Geiberger, Chip Beck and David Duval are the only players to shoot 59 in an official PGA Tour event. Annika Sorenstam shot a 59 on the LPGA Tour.

Mickelson’s 13-under 59 moved him from third place to first, with a 17-under 127 total, which tied the course record. The Masters champion beat PGA champion Vijay Singh by five strokes.

Lefty had 11 birdies, an eagle and no bogeys to win $400,000. He putted just 23 times, including 11 times on the front nine.

Mickelson’s previous competitive career low was 61 at the 2001 Greater Hartford Open. His season low was a 63 at the Bob Hope Chrysler Classic.

Singh, the No. 1 player in the world, shot a 66 and earned $250,000, while first-round leader Retief Goosen — the U.S. Open champ — closed with a 68 to finish at 11-under. British Open champion Todd Hamilton finished last at 1-over 145 after a 75.

In balmy and calm conditions at the oceanside Poipu Bay Golf Course, Mickelson struggled off the tee at times but compensated with impressive short play.

Mickelson became just the third player to win the event since 1998. Last year, Jim Furyk snapped Tiger Woods’ record string of five straight Grand Slam victories.

Mickelson birdied Nos. 13-15 to open a commanding four-stroke edge and closed with birdies on Nos. 16 and 18.