Brooks Koepka held off a late charge from Dustin Johnson to capture his second consecutive PGA Championship on Sunday, completing a wire-to-wire victory for his fourth major title in nerve-wracking fashion.

A near-collapse saw Koepka's record seven-stroke lead reduced to a single shot, but he withstood making four bogeys in a row on the back nine and another at 17 for an unexpectedly narrow triumph.

"This is probably the most satisfied I've been with all the majors," said Koepka. "This one's definitely at the top of the list of how emotionally and how mentally spent I am."

Koepka fired a four-over par 74 final round at windy Bethpage Black to finish 72 holes on eight-under 272 and defeat Johnson by two strokes, replacing him as world No.1 as a result.

"I'm just glad we don't have any more holes to play," ­Koepka said. "That was a stressful round of golf."

Koepka, who seeks his third US Open win in a row next month at Pebble Beach, became the first man to own back-to-back titles at two majors simultaneously by capturing the Wanamaker Trophy and the $1.98 million top prize.

The 29-year-old American became the PGA's fifth wire-to-wire winner after Hal Sutton in 1983, Ray Floyd in 1982, Jack Nicklaus in 1971 and Bobby Nichols in 1964.

Koepka joined Tiger Woods as the only back-to-back stroke-play winners of the PGA, Woods having done it in 2006-07 as well as 1999-2000.

Koepka seized a tournament-record lead of seven strokes after 54 holes on 12-­under par 198.