Koepka held a one-shot lead over Corey Conners and Viktor Hovland heading into the final round at Oak Hill, six weeks after enjoying double that advantage following 54 holes of the year’s first major.
The four-time major winner carded a closing 75 at Augusta National to finish second to Jon Rahm, but looks primed to claim his first major since the 2019 US PGA at Bethpage.
Asked what were the main lessons he had learned from Augusta, the former world number one said: “To just never think the way I thought going into the final round. I think that was a big thing for me.
“I won’t do it again the rest of my career. I promise I won’t show up like that on Sunday.
“I was just told that I think only Tiger and Jack have won three (US PGA titles), so that would be pretty special to be in a list or category with them.”
Four major champions were within five shots of Koepka’s lead, with fellow LIV player Bryson DeChambeau three behind on three under and Justin Rose and Scottie Scheffler both two under.
Rory McIlroy, who is a member of Oak Hill, was another stroke back on one under.
Quote of the day
“I love when the fans are on you, cheering for you, or you know, giving you crap if you screw up” – Koepka had no problem with the raucous crowds in upstate New York.
Shot of the day
Arguably the luckiest shot of the day at least, Scottie Scheffler saw his second shot on the seventh hole skip through Allen’s Creek and on to dry land.
Round of the day
Brooks Koepka carded a second consecutive 66 to take a one-shot lead into the final round.
Statistic of the day
Good news for everyone within four shots of Koepka’s lead, although recent evidence suggests all is not lost for the likes of Rory McIlroy either.
The short par-four 14th again played as the easiest hole, yielding 30 birdies and just three bogeys for an average of 3.645.
There was not a single birdie recorded on the 485-yard ninth hole, with 33 players making bogey and four making a double bogey for a scoring average of 4.539.
Mostly sunny skies and breezy conditions return for the final round with highs warming into the low 70s. A west to northwest wind of 10-15mph, gusting to 20mph, will help with the drying and make it feel cooler at times as well.
Key tee times (all BST)
1850 Justin Suh, Tommy Fleetwood1900 Rory McIlroy, Michael Block1910 Justin Rose, Scottie Scheffler1920 Corey Conners, Bryson DeChambeau1930 Brooks Koepka, Viktor Hovland