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

McIlroy became the youngest ever winner of a Fed Ex 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 favourite to land the $10million top prize when the FedEx series concludes in a fortnight after his victory at TPC Boston.

The USPGA 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.”