The 34-year-old bogeyed his first gap of the day and needed to accept par on the following 10, however it appeared as if he might lastly declare his maiden PGA win as he produced a run of three birdies in 4 holes from the twelfth.
“I am getting shut, that is the great facet of it,” stated Fleetwood. “On the again 9, I managed to get myself forward, performed some actually good golf, putted very well.
“Justin and JJ have executed nice there and I simply did not do sufficient.
“I am clearly upset. I used to be proper in there with an opportunity, and it is arduous.”
Fleetwood has the very best PGA Tour earnings and not using a victory, together with his runner-up finish to Keegan Bradley on the Vacationers Championship in June taking him previous $31.4m (£23.3m).
He has now had six top-five finishes this season and 29 on the US tour – 11 greater than some other participant and not using a win over the previous 40 years, forward of Brett Quigley with 18.
Rose turned the primary participant in his 40s to win on Tour this season, claiming his first title for the reason that Pebble Beach Pro-Am in February 2023.
He trailed by one shot in a single day and had a combined spherical till a run of 4 straight birdies from the 14th.
Rose nearly made it 5 on the final, which might have secured victory with no need a play-off, however his putt was fractionally off beam, that means he completed with a three-under 67.
US Open champion Spaun hit a five-under 65 within the third spherical and the world quantity eight repeated the feat to safe his play-off spot after birdies on the sixteenth and seventeenth.
“That was a tremendous final 90 minutes,” stated Rose. “I by no means stopped believing. I performed unbelievable golf coming down the stretch. I had a lot enjoyable with it.
“After I carry my finest I do know I am adequate to play, to compete, and now to win in opposition to one of the best gamers on this planet.
“It is a very gratifying day for me and loads of arduous work coming to fruition.
“I really feel like there might be a superb run of golf [for me] nonetheless. I can not let my age grow to be an excessive amount of of a narrative however in the present day is big for me.”
The highest 50 gamers within the FedEx Cup standings after Sunday’s spherical now advance to subsequent week’s BMW Championship – the second of the PGA Tour’s three play-off tournaments.