LOUISVILLE, Ky. (AP) — Shane Lowry switched putters in New Orleans last month, frustrated by what was happening on the greens.

Or not happening, to be more specific.

The immediate returns were pretty blah Lowry. Irish countryman and good friend Rory McIlroy paired up with Lowry for a narrow victory at the two-man team event, a win Lowry figures might have been more comfortable if the new putter had cooperated.

Still, Lowry stuck with it, figuring the problem wasn’t with the equipment but his approach. He moved away from focusing on the technical aspect of things ahead of the PGA Championship and put more emphasis on feel and confidence.

The result was one of the best rounds in the history of major championship golf.

Lowry tied a record by firing a 9-under 62 at a very gettable Valhalla on Saturday, zooming up the leaderboard thanks to four-plus hours of near-flawless putting.