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.