Phil Mickelson birdied four of his last five holes in the Desert Classic to take a two-stroke lead into the weekend in his first event of the year. A day after matching his career-low score with 12-under 60 at La Quinta Country Club, the 48-year-old Mickelson had a 68 on PGA West's Nicklaus Tournament Course to reach 16 under. Curtis Luck was second after a 66 on the Nicklaus layout. The 22-year-old Australian rebounded from a bogey on the par-3 eighth with a closing birdie on the par-4 ninth. Adam Hadwin and Steve Marino were 13 under, and defending champion Jon Rahm was another stroke back with Wyndham Clark. Mickelson is making his first tour start since early October and first competitive appearance since beating Tiger Woods in Las Vegas in November in a one-day, made-for-TV event.