Mickelson followed his opening 60 with 65 on Friday in the Phoenix Open to reach 17-under 125, a stroke off the tour record for the first two rounds of a tournament set by Pat Perez in the 2009 Bob Hope Classic and matched by David Toms at Colonial in 2011.
Mickelson tied the Phoenix Open record set by Mark Calcavecchia in 2001.
A day after missing a chance for 59 when his 25-foot putt on the ninth caught the right edge, curled 180 degrees and stayed out, Mickelson hit to 4 feet and rolled the downhill putt into the center of the cup.
Bill Haas is second, four strokes back.
EUROPEAN TOUR: In Dubai, United Arab Emirates, overnight leader Richard Sterne made a birdie on the 18th hole to take a one-shot lead over Thorbjorn Olesen and two others after the second round of the Dubai Desert Classic.
Sterne, who has struggled with injuries, finished with 2-under-par 70 and 12-under 132 total. Olesen (66), Tommy Fleetwood (68) and Stephen Gallacher (70) are a shot back.
Chris Doak (69), Andreas Harto (67) and Maximilian Kieffer (68) are two shots off the pace.
Sergio Garcia (67) is three strokes back despite struggling with shoulder problems that required treatment midway through his round.
LADIES EUROPEAN TOUR: In Gold Coast, Australia, Alison Walshe birdied the 17th hole in an opening-round 6-under 66 that gave her a one-stroke lead over Jessica Korda in the Australian Ladies Masters at Royal Pines.
Korda, the daughter of former professional tennis player Petr Korda,
won last year’s Women’s Australian Open at Royal Melbourne in a playoff for her first LPGA Tour victory.
Belen Mozo, Stacy Keating, Dori Carter and Nontaya Srisawang are two strokes behind with 68s.
Seven-time champion Karrie Webb was in a large group four shots back in the season-opening event of the Ladies European Tour and Australian circuit.
EVENT ON HOLD: In Port Elizabeth, South Africa, the tournament claiming to be among the richest anywhere outside the United States and a challenger to some of the world’s top events has been indefinitely postponed.
Organizers said Friday that the Tournament of Hope, which was to have prize money of $8.5 million, won’t take place in November as planned and has been “put on hold for the foreseeable future” after failing to secure sponsorship.