Brooks Koepka turned his attention to the two remaining majors in 2020 as the American star remained upbeat following his unsuccessful attempt to win a third consecutive US PGA Championship.

Koepka struggled on the final day of the tournament in San Francisco, where Collin Morikawa broke through for his maiden major title thanks to a thrilling two-shot triumph on Sunday.

Eyeing a third straight US PGA crown and fifth major victory, Koepka started the day two strokes off the pace but a final-round 74 saw his hopes dashed at TPC Harding Park.

Koepka finished tied for 29th at three under through 72 holes, 10 shots behind fellow American Morikawa.

"To be honest, the bogey on two was not good," Koepka, with the U.S. Open and Masters to come, said as he reflected on his round.

"But to make the turn at four over was disappointing, to say the least. You knew you had to be under par, at least one, to have a good chance on the back side.

"It's my first bad round in a while in a major. You know, I was just there to cheer Paul [Casey] on. That was it. Just try to help him get it in the house and see how well he could finish, because I had put myself out of it already.

"Hey, wasn't meant to be. 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 the rest of the season and we'll figure it out from there."

Asked about Morikawa as the 23-year-old closed in on his victory ahead of Paul Casey and Dustin Johnson, Koepka said: "He's a hell of a player. He's really good. You see these guys coming out of college now, they are ready to win, and prime example.

"I think of that group, him, Matt Wolff, Viktor Hovland, it's impressive what they do. They come out of college and they're ready to play out here. Hats off to him.

"For this week, it's impressive. This golf course, you really have to golf your ball and make some putts. He was obviously the best at that, and that's impressive. You know, to win a major this young in your career, he's got a lot of upside."