Rory McIlroy celebrated Labor Day with a Boston glee party as he moved ever closer to a $10 million bonanza.

McIlroy became the youngest ever winner of a FedEx event when he overcame a three shot deficit to win the Deutsche Bank Championship in Massachusetts on Monday.

The 23-year-old Ulsterman is now the clear favorite to land the $10 million top prize when the FedEx series concludes in two weeks after his victory at TPC Boston.

The U.S. PGA champion won in style as he overturned a three-shot final-round deficit to squeeze past South Africa’s Louis Oosthuizen and win by one stroke.

The world number one was a further two shots clear of Tiger Woods.

McIlroy said afterwards, “Delighted to get my fifth win on the PGA Tour, third win this year, second win in the last three events.

“Today was great, going out with a three-shot deficit. I just wanted to get off to a good solid start and maybe put Louis under a little bit of pressure.

“I was able to do that playing the first holes three under, and we both made a couple of mistakes on the fifth hole, but he made a six to my five, so I was able to take advantage of that a little bit.

“I think the good start set me up for a solid back nine. There was a couple of shots on the back nine I... well, I won’t take back now, but if I could have then, I would have.

“But I still managed to do enough, and as I said, delighted to get this win, delighted to go to number one in the FedEx Cup. It sets me up for a great next couple of weeks, so overall I’m just very pleased.”

Rory McIlroy shows off the Deutsche Bank trophy, which he won by one stroke from Louis OosthuizenBoston Globe