According to the PGA Tour, Mickelson has done it seven times, most recently 21 years ago at Torrey Pines. 'I may have done it before but I don't ever recall doing it'.
Northern Irishman Graeme McDowell is four under after bogeying the final hole at Pebble Beach.
Phil Mickelson fired a 6-under 65 in Round 1 of the Pebble Beach Pro-Am on Thursday, and he hit every fairway for the first time in over 20 years.
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"I have made lots of changes over the last few years and think my game is close", Scott told AAP on Wednesday.
In the big-money event, staged over three famed courses, Pebble Beach Golf Links, Spyglass Hill Golf Course, and Monterey Peninsula Country Club Shore, top professionals and celebrity amateurs enter the field for the first three days, teaming up and playing best ball.
"I'm on my way to getting it again", Scott said.
Gay finished his front nine at Monterey Peninsula with five straight birdies.
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"I have the honour to play all three courses here and, just because of such handsome scenery, I couldn't even focus on where my ball was going", Choi said of Pebble Beach Golf Links, which is set on the famed Monterey Peninsula.
Now, the 31-year-old has given himself a hot start to the Pebble Beach Pro Am - where he has recorded five top-six results, including a runner-up last year, without lifting the trophy. They are tied for second with South Korea's Si Woo Kim, who posted the low score on the Pebble Beach course, and Cody Gribble, the low man at Spyglass Hill on Thursday.
Dustin Johnson, not so fresh after his victory Sunday halfway around the world at the Saudi International, and Jordan Spieth each had a five-under 66 at Monterey. He opened with four bogeys in 10 holes and rallied for a 72 at Monterey Peninsula.
Spieth was even at the turn but ran in five birdies coming home.
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Langley, who started on the back nine, ripped off eight birdies in a 12-hole span from No. 12 to No. 5, but he also made two bogeys on the day.