Dustin Johnson has regained the world number one spot by winning the St Jude Classic in Memphis.
The 33-year-old climbed back to the top of the world rankings for the first time since May 13, courtesy of his tournament-winning 19 under par score.
Johnson's second tournament win of the season tees up the American nicely for the US Open, which starts on June 14.
He won the 2016 edition of the US Open at Oakmont in 2016, and will carry extra momentum into this year's major at Shinnecock Hills in New York.
Johnson entered the final day in a share of the lead with Andrew Putnam but was quickly handed the initiative when his fellow American made a double-bogey on the first.
He maintained his two-shot lead at the turn and then made birdies on the 13th and 16th before spectacularly holing out from 171 yards on the par-four last for an eagle and a six-shot victory.
JB Holmes finished third at nine under, a shot clear of 2009 Open champion Stewart Cink and Richy Werenski.
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Novak Djokovic has beaten Roger Federer to win the US Open men's title for the second time.
Federer has been back to his best and enjoyed the almost complete backing of the American support, but Djokovic showed his determination again to win 6-4 5-7 6-4 6-4.
After a four set match lasting three hours and 20 minutes, Djokovic turned to his box and pointed to his chest before commiserating his beaten opponent at the net.
"It's quite an incredible evening for me," he said.
"You can only give your best and I was trying to do that knowing he would be aggressive and not drop his level.
"He was always going to take the best out of me and I needed to do that to win this trophy."