American Brendon Todd holds a one-shot lead going into the final round of the World Golf Championships (WGC) FedEx St Jude Invitational, after his advantage at the top of the leaderboard was halved.
A week after missing the cut in Minnesota in the 3M Open, Koepka had nine birdies and a bogey on a windy day at TPC Southwind in the World Golf Championship event.
"I was just fading a little bit more off the tee than I would like to".
"That's the easiest to put on the green, to not hit in the water", Todd said.
Rickie Fowler was two strokes back after a 69. This was his eighth time shooting under par in his last nine rounds here.
"It's nice to see those results and all the changes we've made come through", Koepka said.
Matthew Fitzpatrick of England, coming off a solo third in the Memorial Tournament, holed out from 53 yards for an eagle on the third hole en route to a 64 and is one more behind in a tie for sixth with Sung Kang of South Korea, who wound up at 69.
Fowler then ended up in design with another not likely birdie from outdoors 40 feet, and he stated: "It's been good to see some putts enter, and these greens have to do with as excellent as they get". He credited getting back to playing golf instead of just working on the range.
"I played good, I drove it well, putted well, chipped it well, did everything very solid, missed in the correct spots", he said. "I'm really excited about how I played and looking forward to the opportunity this weekend".
Fourth-ranked Webb Simpson, another two-time victor this season, totaled 66 with four birdies on the back nine and is six strokes down in a tie for eighth with Jason Day of Australia, who had a 67, Louis Oosthuizen of South Africa, who also shot 67, and Sungjae Im of South Korea, who came in at 68.
Dustin Johnson, Danny Willett and Henrik Stenson all shot one under par, with new world number one Jon Rahm returning a level-par 70 containing four birdies and four bogeys. He said he didn't play like a No. 1 player, especially on a day where players could lift, clean and place on ideal greens.
But Koepka said he wasn't anxious with 36 holes remaining. "I felt awful, I could not figure out where the ball was going to go, and I was just trying to minimize mistakes". Rory McIlroy's bid to be No. 1 again may have to wait until the PGA Championship next week. He opened with a 73.
Fowler had actually matched Todd's 64 on the first day, and the popular American likewise commemorated a long birdie putt on the 8th hole, which topped a run of 3 in a row as he raced to 10 under par.
Koepka bogeyed No. 7. when he missed a 10-footer. "There were a couple of pins I think that were more hard on one, 14 and 16, so there were some birdie opportunities, but you still have to place the ball in the right area and make some putts".
But he struggled with three bogeys and three birdies on the back side, the highlights being a 15-foot birdie putt at the par-4 12th and a birdie at the par-5 16th after sending his second shot into a greenside bunker.
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