Dustin Johnson is the hot favourite for the US Open after he emphatically reclaimed the No.1 ranking, holing out for eagle from 170 yards on the final hole for a six-stroke victory at the St. Jude Classic.
"What a cool way to end the day," Johnson said.
Johnson shot a four-under 66 to finish at 19 under for his second PGA Tour victory this year and 18th of his career to move back to the top of the world golf rankings.
He had held that status for 64 straight weeks before being usurped by fellow American Justin Thomas on May 13.
Johnson finished with the eagle, three birdies and a bogey on Sunday while co-overnight leader Andrew Putnam started the final round with a double bogey on his way to a 72.
Preparing for the US Open, which he won in 2016, Johnson cruised to victory and heads to Shinnecock Hills after stringing together four straight rounds in the 60s.
He went 67, 63 and 65 before wrapping up a final round that felt almost like a practice round with the only question remaining how low Johnson would go.
At least until his dramatic walk-off eagle.
Johnson was in the intermediate rough to the right of the fairway, and the ball bounced twice before rolling into the cup to bring fans to their feet.
J.B. Holmes (67) was third, 10 shots off the winner at nine under.
Phil Mickelson had a 65 on Sunday and was at six under in a tie for 12th in a group which included Stuart Appleby, who closed with a 69.
His fellow Australian Cameron Percy had a 68 to be tied for 26th at four under while Aaron Baddeley (71) and Matt Jones (73) finished tied for 37th and 51st respectively.
Putnam, a two-time winner on the Web.com Tour, had only one bogey through his first three rounds but never recovered after his poor opening hole, which included a three putt.
Johnson worked on keeping the ball in the fairway, hitting 3-wood off the tee on the first of the course's two par 5s. Even with the 3-wood, Johnson had the second-longest drive of the day, hitting 333 yards on the 554-yard hole.
Johnson hit an iron 307 yards off the tee at No.10 and a driver 359 yards on the par-4 No.13, leaving him 95 yards to the pin.
He previewed his dramatic finish on the par-5 16th. Johnson's tee shot found the trees right of the fairway, and he threaded a shot through a couple trees to just off the green. He chipped to five feet and birdied for a four-stroke lead.