Rory McIlroy became the youngest player to win two majors with an eight-shot victory in the US PGA Championship.
The 23-year-old from Northern Ireland finished on 13 under, with Englishman David Lynn stunning the field by taking second - his previous best at a major was tied 53rd at the 2003 Open.
Four-time winner Tiger Woods failed to make the most of the birdie chances he created, ending on two under, reports the BBC.
England's Justin Rose and Ian Poulter were in a four-way tie for third.
Last year's winner Keegan Bradley and Swede Carl Pettersson also finished joint third on four under for the championship.
Lynn's second-placed finish moves him to 16th on the European money list, with an outside chance of making Europe's Ryder Cup team.
"I got myself into the zone yesterday and I was feeling comfortable today - it is all a bit surreal at the moment," said the 38-year-old Stoke-based player.
He will undoubtedly get a sidebar in Monday's newspapers, alongside headline act McIlroy.
Aside from a second-round blip 75, when he and many of his peers were bullied by Kiawah Island at its wildest, the new champion mastered the Ocean Course.
His final day began earlier than scheduled as a result of Saturday's rain which brought a halt to several third rounds.
Having sunk five birdies on the front nine the previous day, the man from Holywood added two more on the 15th and 16th to start the final round on seven under, a three-shot lead over second-placed Pettersson.
Swede Pettersson's hopes of a maiden major suffered a huge blow on the first hole when he was handed a two-shot penalty 'for moving a loose impediment in a hazard', when a leaf moved.
Despite the setback, Pettersson holed four birdies en route to five under for the tournament - his best major finish.
McIlroy suffered no such ill fortune. He was the only one of the top six not to drop a shot during his final round.