Phil Mickelson, who posted a career-low 60 in round one, carded a four-under-par 68 at the at the Nicklaus Tournament Course on Friday.
Phil Mickelson opened up a three-shot lead at the Desert Classic thanks to a first-round 60.
After winning the CareerBuilder Challenge, Jon Rahm is set to climb into second in the world rankings.
Spaniard Jon Rahm claimed the CareerBuilder Challenge title after a play-off.
Jon Rahm is in contention at the CareerBuilder Challenge, sitting in a tie for fourth after the third round.
American Andrew Landry birdied five of his last eight holes to take the lead entering the weekend at 16 under.
Spaniard Jon Rahm enjoyed a bogey-free round to earn a one-stroke lead at the PGA Tour tournament.