Gainey later reflected on what had been a difficult season.
"It's been a hard year for me and finally, we got it right," said the 37-year-old with the unconventional swing.
"I get bashed all the time about my swing," Gainey acknowledged, but added: "The only thing that matters is right before impact on the downswing."
Furyk, meanwhile, couldn't hide his disappointment after again wobbling down the stretch. Poor finishes this year have cost him at the US Open and also the Ryder Cup where he critically lost the final two holes to suffer defeat to Sergio Garcia in the dramatic Sunday singles.
"I think what I'm most disappointed about is when it came down the stretch, hitting the ball pretty much as good as I can, I made really, really poor swings at 17 and 18 with a seven-iron and eight-iron," Furyk said.
"So to play those two holes and not get one good look at it for birdie was disappointing."
