ATLANTA — Patrick Cantlay was on the verge of losing his two-shot lead on one hole, with nothing less than the FedEx Cup, the $15 million prize and his newfound reputation as “Patty Ice” on the line.

He was clutch as ever in his biggest moment Sunday in the Tour Championship.

Cantlay made a nervy 6-foot bogey putt on the 17th hole to stay one shot ahead of Jon Rahm going to the par-5 18th hole at East Lake. Then, he hit his longest drive of the week — 361 yards down the middle — with Rahm already in the fairway.

The final shot was a 6-iron from 218 yards to 12 feet — the closest of anyone all day — that all but clinched the one-shot victory, the FedEx Cup and perhaps even PGA Tour player of the year.

“It was the best shot I hit all week,” Cantlay said.

Cantlay outlasted Bryson DeChambeau in a six-hole playoff at the BMW Championship. One week later, he held off the No. 1 player in the world with his one-shot victory over Rahm in the Tour Championship.

The nickname only surfaced last week, and it’s starting to stick.

“To me, it just means cool under pressure, and I think that suits my personality really well,” said Cantlay, who never changed his expression until a big smile when he tapped in for birdie and a 1-under 69, waving his cap to thousands of fans around the green.