No.4 Young cruises to PGA title at Doral

World number four Cameron Young of the United States won the PGA Cadillac Championship at Trump National Doral (Orlando Ramirez)

(Orlando Ramirez/GETTY IMAGES NORTH AMERICA/Getty Images via AFP)

World number four Cameron Young cruised through Sunday's final round despite a penalty to win the Cadillac Championship by six strokes, taking his third career PGA Tour triumph.

The 28-year-old American called a penalty on himself in the second fairway when he saw the ball move then salvaged par on his way to firing a four-under par 68.

He finished 72 holes on 19-under 269 for the $3.6 million top prize at Trump National Doral.

Young became only the third wire-to-wire winner at Doral, the first since Andy Bean in 1977.

"When the golf course is difficult, when the playing conditions are difficult, that tends to make it easier for me mentally," Young said.

"That's a big part of keeping yourself in it out here... thankfully I was able to stay where my feet were and hit a bunch of good shots."

Young, who turns 29 on Thursday, won his first PGA title last August at Greensboro, captured the Players Championship in March and shared third last month at the Masters.

His six-stroke victory margin matched the largest ever in a PGA event at Doral, a feat last managed by Hubert Green in 1976.

"The self-belief just continues to build," Young said. "I put myself in plenty of good places over the course of the last four or five years and recently have started to come out on the better side of it so excited for the next few weeks."

More than an inch of rain fell overnight, delaying the final round of the $20 million signature event after softening the Blue Monster course.

US President Donald Trump watched Young sink his final putt from a suite at the 18th hole.

Top-ranked Scottie Scheffler birdied three of the last four holes to shoot 68 and finish second on 275, one stroke ahead of fellow American Ben Griffin.

It was the third consecutive runner-up finish for Scheffler after placing second at the Masters and Heritage tournaments last month. Not since 2014 had one player managed three PGA runner-up efforts in a row.