With two courses in use this week, Harris was the only co-leader who did not play Saturday at Pebble Beach, which will play host to the final round.
Craig Stadler (66), who won this title in 2004, is one shot off the lead.
Both the first and second rounds were completed Saturday after play at Pebble Beach was delayed several times Friday because of fog.
Wisconsin business offering 'therapeutic cuddling' forced to close
Ohio crash that killed two caught on camera [VIDEO]