EDISON, N.J.

Jason Day, so poor as a kid that he shopped at a store where he stuffed as much used clothing as he could into a bag for $5, is trying not to think about the potential of a $10 million bonus for winning the FedEx Cup. That’s still four weeks away.

Day, so cocksure as a teenager that he talked about being No. 1 even before he was a PGA Tour rookie, is trying to keep his mind off the possibility that he could rise above Rory McIlroy and Jordan Spieth and claim the top spot in the world ranking. That could be as little as one week away.

His six-shot victory Sunday in The Barclays opened a whole world of possibilities.

“I can only control what I can control,” Day said.

And he has a great grip on that at the moment.

Fresh off his first major title at the PGA Championship, Day used that frightening blend of power and putting to bury another world-class field at The Barclays. He finished off a sensational weekend at Plainfield Country Club with an 8-under 62, the lowest closing round by a winner this year on the PGA Tour.

Henrik Stenson got within two shots after back-to-back birdies until he stalled with four holes to play, and Day made a pair of long putts across the green for birdies to stretch the lead and give him a peaceful walk up the 18th hole.

Relentless to the end, he hit driver to the edge of the green and made birdie to complete a 63-62 weekend.

McIlroy, who didn’t play in the opening FedEx Cup playoff event so he could give his ankle an extra week of rest, moved back to No. 1 when Spieth missed the cut at The Barclays. That figured to be a two-man battle for the next month, except that now it’s a three-man race.

Day could go to No. 1 with a victory at the Deutsche Bank Championship at the TPC Boston, which starts Friday.

And the 27-year-old Australian would figure to be the favorite, at least considering how the last month has gone.

Since leaving the U.S. Open with vertigo symptoms, Day has won three of his five tournaments and is 62-under par in 20 rounds. He was 17 under when he won the Canadian Open by one shot over Bubba Watson. He set a major championship record to par when he won the PGA Championship at 20 under at Whistling Straits for a threeshot win over Spieth. And he finished at 19-under 261 to beat Stenson by six shots.

Day remains at No. 3 in the world, but now enters the picture with Spieth and McIlroy for golf supremacy. All three will have a mathematical chance to get to No. 1 at the TPC Boston next week.

The only battle was to be among the top 100 who advanced to the next playoff event.

PGA Tour rookie Zac Blair was among eight players who played their way into the top 100, and he did it in a big way. He closed with a 66 and tied for fourth, moving him from No. 106 to No. 35.

Camilo Villegas at No. 123 appeared to be playing his way out of another week when he made three straight bogeys early on the back nine. Facing elimination if he failed to make par on the 18th, he got up-and-down by making a par putt from just inside 10 feet.

LPGA Tour

PRATTVILLE, Ala. (AP) — Kris Tamulis won the Yokohama Tire LPGA Classic for her first LPGA Tour title.

Tamulis played 29 holes Sunday in the twice-delayed tournament, the 186th of her LPGA Tour career. She finished a third-round 67 and closed with a 65 to beat Yani Tseng and Austin Ernst by a stroke.

Champions Tour

ENDICOTT, N.Y. (AP) — Jeff Maggert won the Dick’s Sporting Goods Open on Sunday for his fourth Champions Tour victory of the year, closing with a 6-under 66 to beat Paul Goydos by two strokes.

Maggert took the lead in the Charles Schwab Cup standings, 119 points ahead of Colin Montgomerie.

Maggert finished at 14- under 202 at En-Joie.