'I knew I needed to get it up and down to have a chance to make the weekend,' Mickelson said.
Mickelson made a birdie from off the back of the ninth green, his 18th hole, to get to even par, the projected cut line.
Mickelson said if he makes the cut, he isn't ruling out a chance to win, though he was 11 shots back when he signed his scorecard. Mickelson said the TPC Sawgrass Stadium Course is a good place to make big moves posting low early scores.
'I've played in the last groups here, and I've seen guys march right up the leaderboard (from back of the pack),' he said. 'I'm not giving up at all.'
Mickelson shot 1-under 71 Friday despite needing 34 putts. He's pleased with his ball striking. He hit 10 fairways and 15 greens in the second round.
'I'm hitting the ball really well,' he said. 'I hit fairways and greens and didn't make squat. I'm not frustrated yet. I feel like I'm playing well.'