Austin Cook played a six-hole stretch in 6 under and shot an 8-under 64 in breezy conditions Saturday to take the lead at the CareerBuilder Challenge.
Cook began the run at La Quinta Country Club with birdies on Nos. 4-5, eagled the sixth and added birdies on No. 7 and 9 to make the turn in 6-under 30.
After a bogey on the 10th, he birdied Nos. 11, 12 and 15 and saved par on the 18th with a 20-footer to take a 19-under 197 total into the final round on PGA West's Stadium Course. The 26-year-old former Arkansas player is making his first start in the event. He won at Sea Island in November for his first PGA Tour title.
Fellow former Razorbacks star Andrew Landry and Martin Piller were a stroke back. Landry, the second-round leader, had a 70 on the Stadium Course. Piller, the husband of LPGA Tour player Gerina Piller, shot a 67 at La Quinta. They are both winless on the PGA Tour.
Jon Rahm had a 70 at the Stadium Course to reach 17 under. The top-ranked player in the field at No. 3, Rahm beat up the par 5s again, but had four bogeys — three on par 3s. He has played the 12 par 5s in 13 under with an eagle and 11 birdies.
Scott Piercy also was two strokes back after a 66 at the Stadium.
Adam Hadwin had a 67 at La Quinta a year after shooting a third-round 59 on the course. The Canadian was 16 under along with Grayson Murray and Brandon Harkins. Murray had a 67 on PGA West's Jack Nicklaus Tournament Course, and Harkins shot 68 on the Stadium Course.
Phil Mickelson missed the cut in his first tournament of the year for the second time in his career, shooting a 74 on the Stadium Course to finish at 4 under — four strokes from a Sunday tee time.
The 47-year-old Hall of Famer was playing for the first time since late October.
He also missed the cut in the Phoenix Open in his 2009 opener.
Charlie Reiter, the Palm Desert High School senior playing on the first sponsor exemption the event has given to an amateur, also missed the cut. The Southern California recruit had three early straight double bogeys in a 77 on the Stadium that left him 1 over for the week.
John Daly had an 80 at La Quinta. He opened with a triple bogey and had six bogeys — four in a row to start his second nine — and only one birdie. The 51-year-old Daly opened with a 69 on the Nicklaus layout and had a 71 on Friday at the Stadium.