It was Stenson's first European Tour success of the year after winning two of the closing four FedEx Cup Play Off Series events.
He collected a first prize of $US1.333 million to take his earnings in 2013 in Europe alone to $US5.538 million.
"To achieve the double, double if you like in winning the DP World Tour Championship and the Race to Dubai on top of winning the PGA Tour Championship to capture the FedEx Cup takes some beating, I guess," Stenson said.
"I am just very, very pleased with the way I played. I knew it was going to be a tough week as I knew the guys like Justin (Rose) and Ian (Poulter) would come charging at me and try to catch me."
England's Ian Poulter birdied his closing two holes, shooting a 66 as he finished second on 19-under par to end the season in second place in the Race to Dubai.
"I have to take my hat off to Henrik as he is unbelievable," said Poulter.
"I tried to run him down as hard as I could but even with a sore wrist he has pressed on and I just could not get close enough. Henrik has not made a mistake all week and all I could do was make sure of second place and some valuable Ryder Cup points.
"I have thrown a lot of him and given him so much stick but he is the best player on the planet right now."
Victor Dubuisson of France shot a 71 to claim third place on 17 under, to end the season sixth.
Out-going European No. 1 Rory McIlroy continues to show signs of getting back to his best with a closing round 67 to share fifth place at 15-under par.
Justin Rose of England shared tenth place with Sweden's Peter Hanson after a final-round of 70 to finish on 13 under.
- AP
