Rory McIlroy scored 66 on his final round to take home the Tour Championship for the second time in his career.
The Northern Irishman finished four shots clear of Xander Schauffele, in second.
Behind them was world number one Brooks Koepka, who finished five shots behind the leader.
The pair went toe-to-toe in Memphis at the WGC-FedEx St Jude Invitational last month, with the American coming out on top – winning by five shots.
But at the East Lake Golf Course in Atlanta, McIlroy was the star as he pulled away from the pack when it mattered.
Speaking afterwards, the 30-year-old explained that he believes he has exercised the demons of last year – when he lost to Tiger Woods.
“I must say, I didn’t enjoy that walk last year like everybody else did,” McIlroy said.
“I played terribly, I got myself into the final group and never took the fight to Tiger.
“Going up against the No. 1 player in the world today — he got one over on me in Memphis and I wanted to sort of try to get some revenge today.
“So to play like that alongside Brooks and get the win, win the FedEx cup, it’s awesome.
“And it’s amazing how different things can be in a year.
“My goal today was to win by even strokes.
“My goal was to shoot the lowest score of the week and I think with the birdie on the last I did that.
“That’s why I was concentrating so much.
“It’s such a cool way to end what has been a great season.”