JERSEY CITY, N.J.—Tony Finau was developing a label as the player who did everything right but win. What he never lost was his belief he could beat the best. That moment finally arrived late Monday afternoon at The Northern Trust against the sunlit backdrop of the Manhattan skyline. Finau delivered the best back nine of his career to track down Jon Rahm, the world’s No. 1 player, and then beat Cameron Smith in a playoff. Finau tapped in the winning par putt at Liberty National, tilted his head to the sky and fluttered his lips in a sigh that was equal parts relief and satisfaction. “It’s more massive I think for just my sense of accomplishment,” he said. “It’s hard losing, and it’s hard losing in front of the world. I’ve done it already a couple of times this year. That made me more hungry. If it doesn’t discourage you, …