Brooks Koepka successfully defended his US PGA Championship title to make Major history after a dramatic final day at Bethpage State Park BK Course.
The American entered round four with a record seven shot lead and still led by six with eight to play but his advantage was down to one as he stood on the 15th tee after a run of four bogeys.
Dustin Johnson was the man chasing him down but the World Number One - who Koepka will now replace at the top of the Rankings - bogeyed two of his last three holes and the leader looked comfortable again with a three shot cushion.
But on what was one of the most dramatic Major Sundays in recent memory, Koepka bogeyed the 17th and found trouble off the tee at the last before saving par and signing for a 74 that gave him a two shot victory at eight under.
England's Matt Wallace finished at two under alongside Americans Patrick Cantlay and Jordan Spieth to achieve his best Major finish but the day belonged to Koepka who took his place among the golfing greats.
A fourth Major title out of his last eight puts him alongside Ben Hogan, Jack Nicklaus and Tiger Woods as the only players to win so many in so short a span, and he becomes the first wire to wire winner of a Major since Spieth at The 2017 Open Championship.
The 29-year-old's fourth Major title also makes him the first player to win both the US PGA Championship and U.S. Open back to back, and the first to be a two time reigning champion at simultaneous Majors.
Koepka's tally in golf's big four now matches that he achieved on the European Challenge Tour in 2012 and 2013 as he made his start in the professional game, an experience he has often credited as a big step in his development.
He is also now the only player under 30 with four Major titles and after conquering one of the toughest tests in the world of golf, there could be many more to follow.
"It’s incredible," he said. "I don’t even know if I dreamed of this. This is cool. I am still in shock right now, this is awesome.
"I’m just glad we didn’t have to play any more holes, that was a stressful round of golf.
"The wind was up, DJ played awesome and he put the pressure on. I’m glad to have this thing (the Wanamaker Trophy) back in my hands."
Koepka played a heavy second shot on the first to surrender a bogey and with playing partner Harold Varner III making a birdie, the lead was down to five.
But as Varner fell back, it was Johnson who established himself as the nearest threat, playing an excellent pitch at the par five fourth for a first birdie of the day.
It’s incredible. I don’t even know if I dreamed of this. This is cool. I am still in shock right now, this is awesome - Brooks Koepka
Koepka also made the most of the par five after finding the green in two but when Johnson hit an approach to eight feet at the sixth and put an approach to tap-in range on the ninth, he was just four shots back.
Johnson failed to get up and down from sand on the 11th and Koepka put his approach to tap-in range on the tenth for a two shot swing and six shot lead but there was more drama to come.
The leader could only advance his second to the fairway after finding sand off the 11th tee and he had the same problem from a nasty lie on the next, going bogey-bogey and seeing his advantage cut back to four.
He went a long way left off the 13th tee for another bogey before Johnson holed a ten footer on the 15th, and a tee shot over the back of the 14th made it four bogeys in a row.
Johnson missed the green at the 16th and 17th for back to back bogeys but Koepka three putted the penultimate hole to take the drama up the last.
Wallace holed a 19 footer on the second but then made nine pars in a row before finding a nasty lie off the 12th tee and three putting for a double bogey.
Another dropped shot on the 17th saw the four time European Tour winner sign for a 72 but he will be left to reflect on an excellent week as he took another step forward in his career.
Spieth and Cantlay both signed for rounds of 71 to sit a shot ahead of another American in Luke List, with just six players under par.
Dane Lucas Bjerregaard holed a six iron from 206 yards for a one bounce hole in one on the 17th, with playing partner Lucas Glover then making a bunker shot as the duo played the hole in a combined three shots.
