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 the 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 a record-setting 62, was two strokes back with Michael Thorbjornsen (67) and Mark Hubbard (69).

Knapp was in a large pack of players, including Collin Morikawa (64), Hideki Matsuyama (66) and Roy (71) who were 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 the 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 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.”

LIV golf

Patrick Reed and Harold Varner III each shot 5-under 67 at Maridoe Golf Club in Carrollton, Texas, to share the first-round lead in LIV Golf Dallas.

Reed eagled the 655-yard, par-5 second hole and had four birdies and a bogey. Varner, Reed’s 4Aces teammate, had six birdies and a closing bogey.

Jon Rahm was a stroke back. Abraham Ancer shot 69, and Dustin Johnson was at 70 with Graeme McDowell, Anirban Lahiri, Richard Bland and David Puig.

Bryson DeChambeau opened with a 72. He lives in Dallas and played his college golf at SMU.

Points leader Joaquin Niemann, coming off a victory at LIV Golf Virginia, shot 78. He had a 10 on the par-5 seventh.

Brooks Koepka withdrew during the round because of illness. He smashed a tee marker with his driver on the ninth hole.

LPGA tour

Jennifer Kupcho and Leona Maguire shot a 10-under 60 in better-ball play to take the second-round lead in the Dow Championship, the LPGA Tour’s only team event.

The Solheim Cup rivals had a 13-under 127 total at Midland (Mich.) Country Club after opening with an alternate-shot 67 on Thursday. They had a one-stroke lead over Cassie Porter and Gemma Dryburgh, the first-round leaders who parred the final six holes in a 62. The teams will play another alternate-shot round today, and close with a better-ball round Sunday.

The teams of Sarah Schmelzel-Albane Valenzuela (61), Manon De Roey-Pauline Roussin-Bouchard (61) and and Yan Liu-Yahui Zhang (62) were 11 under.

pga tour champions

Padraig Harrington and Stewart Cink endured the ups and downs of the U.S. Senior Open together for a second straight day and found themselves tied for the lead.

The payoff — sharing the final tee time to kick off the weekend at the hilly, hard-to-read Broadmoor.

Cink made up five shots over the final nine holes of his head-to-head pairing against Harrington, and the players headed into the weekend tied at 6-under 134, along with late-charging Mark Hensby.

Cink shot 31 on the front nine, their second nine, to match Harrington’s score on the back.

Both players — the only two who average more than 300 yards driving on the 50-and-over PGA Tour Champions — called it a comfortable pairing, especially on a hilly course at altitude where gauging distance is anything but routine.