Koepka went into the final round two shots back of overnight leader Dustin Johnson but spiralled down the leaderboard with the second-worst score of the day.

Jim Herman carded a 75.

"I mean, it's my first bad round in a while in a major. It just wasn't meant to be," said Koepka, who finished 10 strokes behind champion Collin Morikawa.

“It's my first bad round in a while in a major. It just wasn't meant to be.” – Brooks Koepka

"Three in a row, you're not really supposed to do two in a row looking at history, but that's all right.

"Got two more majors the rest of the season and we'll figure it out from there."

Koepka, 30, was quick to pay tribute to 23-year-old Morikawa, who shot a six-under-par 64 for his first major title.

"He's a hell of a player. You see these guys coming out of college now, they are ready to win," Koepka said.

"To win a major this young, he's got a lot of upside."