DETROIT (AP) — Jake Knapp has pulled off a feat no one else has in PGA TOUR history.

Knapp shot an 11-under 61 on Friday to break a Rocket Classic record that stood for less than a day and became the first on TOUR to break 60 and shoot a 61 or lower in the same season.

That still wasn't enough to put him in the top six entering the weekend at Detroit Golf Club.

Chris Kirk (65), Philip Knowles (64) and Andrew Putnam (66) share the second-round lead at 14 under. Jackson Suber (65) was another shot back.

Aldrich Potgieter, who had a 70 after sharing the 18-hole lead with Kevin Roy after both shot a record-setting 62, and Mark Hubbard were another stroke behind the leader.

Knapp was in a large pack of players, including with Collin Morikawa (64), Hideki Matsuyama (66) and Roy (71), three shots off the lead going into the third round.

The 31-year-old Knapp, who won the Mexico Open last year as a rookie, started the second round 130th in the 156-player field after opening with a 72. He surged into contention with nine birdies and an eagle in a bogey-free round.

“I was just probably upset all night and this morning, so I think that maybe helped a little bit,” he said.

Knapp, ranked No. 99 in the world, is the only player on TOUR to shoot 61 or better in two rounds this season.

He shot a 59 — one off the tour scoring record of 58 set by Jim Furyk in 2016 — at the Cognizant Classic in The Palm Beaches four months ago, when he broke the tournament scoring record before cooling off and tying for sixth.

Knapp broke the 18-hole record at Detroit Golf Club that was set Thursday in the first round when Potgieter and Roy both shot a 62.

“I feel like when I start making birdies, I want to make more,” Knapp said. “I was even kind of thinking about 59 when I stuck it close on my third to last hole.”

The 28-year-old Knowles, shooting for his first PGA TOUR win, made the cut for just the third time in 11 events after failing to make it to the weekend at five straight tournaments.

“It’s not been my best year thus far by any stretch of the imagination, but golf is funny,” Knowles said. “When you’re playing bad, you never feel like you’re going to play good again. And when you have days like today, you just don’t understand how you could ever shoot a bad round of golf.”

The 40-year-old Kirk, whose sixth win was the season-opening tournament last year at Kapalua, opened the second round with three straight birdies and finished with nine birdies and two bogeys.

Most of the leaders were in morning groups, when conditions were more favorable, and Putnam was an exception.

Putnam played in the afternoon when the wind was stiff and swirling on a hot and steamy day. He started strong with three birdies and a bogey on the front nine before getting only one birdie on the back, putting him in a position to possibly win his second PGA TOUR event and first since 2018.

“The wind came up, got a couple tricky holes out there, so glad I could grind it out,” Putnam said.