History was being made in Atlanta, but a play-off was needed to decide whether it was Jason Dufner - five clear with only four to play - or fellow American Keegan Bradley who achieved it.
They went into a three-hole play-off for the US PGA Championship, but whoever came out on top it would bring about a golfing first - never before have seven Majors in a row been taken by first-time winners.
Dufner, without a victory of any sort in 147 previous starts on the US PGA Tour, looked certain to triumph leaving the 14th green at 11 under par.
He had that huge lead, but, in an unbelievable finish, it was wiped out by the time he reached the final tee and it was to his credit that he parred the 471 yard par four to force three extra holes.
Keegan, trying to become the first player to win on his first appearance in a Major since Ben Curtis at Sandwich in 2003, had triple-bogeyed the 15th, but birdied the 16th and made a 40 footer for another at the short 17th.
Dufner followed Bradley into the water on the 15th, got away with a bogey with a 12 foot putt, but then dropped more shots on the next two as the pressure built.
Swede Robert Karlsson felt it too. He had been one behind, but bogeyed the last three and allowed Dane Anders Hansen to come third on seven under, one behind the leaders.
The shock was that on the first three days, Dufner was three under par for holes 15 to 18, two better than anybody else in the field.
But they got him in the end just like they got just about everybody else at some stage.
Luke Donald and Lee Westwood finished joint eighth, their late errors in the third round proving too much to recover from.