Mickelson, who was runner-up to Adam Long at last month's Desert Classic but missed the cut at the Phoenix Open last week, hit all 13 fairways for the first time in a PGA Tour round since the Farmers Insurance Open in 1998. Murray noticed Pat Perez had already signed it, looked at the scribbling on the bill of the cap and said, "He misspelled his name".
The evergreen 48-year-old had a quiet front-nine before enjoying a run of three birdies in four holes after the turn, and he picked up further shots at 16 and 18 to ensure he would end the day just a stroke adrift of early pace-setters Brian Gay and Scott Langley.
Cody Gribble had a 6-under 66 at Spyglass Hill and Si Woo Kim had a 6-under 66 at Pebble Beach. Next best in the betting is Australian Jason day at 8/1, while there is a big gap out to 20/1 for the next priced golfers.
Gay made rapid strides up the leaderboard when he reeled off five consecutive birdies and added three more over the last five holes to post a 64 which was later matches by Langley, with both leaders making their scores at the Monterey layout. Jordan Spieth and Dustin Johnson were also on five under.
He played in his usual group with hockey great Wayne Gretzky, Jordan Spieth and country singer Jake Owen.
It wasn't easy for everyone.
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Ho Sung Choi, the South Korean who has become a video sensation with the gyrations he makes after his swing, played alongside Green Bay Packers quarterback Aaron Rodgers, who greeted him with "hello" in Korean.
"I'm very close to getting back to where I need to be".
The Portrush star (39) produced some vintage iron play just four months before he returns to the Monterey Peninsula for another US Open tilt.
And now the real work begins.
And a few more photos of the sports power couple. The starting times were moved up an hour on Friday.
"I don't mind it", he said. And he's a terrific bad-weather player, the type of guy who could thrive in the wind and rain.