Mickelson, who is chasing his 50th career victory, was flawless from the tee as he hit 13 out of 13 fairways - the first time he recorded a 100 per cent success rate in that department on the PGA Tour since 1998, although he was unaware that he had managed this before.
"I may have done it before, but I don't ever recall doing it", a satisfied Mickelson said afterwards.
Phil Mickelson hit every fairway for the first time in 21 years on his way to a six-under 65 at Monterey Peninsula, an ideal start Thursday on perhaps the last ideal day at the AT&T Pebble Beach Pro-Am.
"I have made lots of changes over the last few years and think my game is close", Scott told AAP on Wednesday.
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Over three rain-softened tracks - the Shore Course at Monterey Peninsula, Spyglass Hill and Pebble Beach - 59 players in the 156-man field shot in the 60s.
Hosung Choi, a two-time victor on the Japan Golf Tour whose extravagant body English after every shot made him an internet sensation, came back after a poor start.
While he failed to get up and down from sand and dropped shots at the par-three fifth and 12th holes, his iron play was superb and his putting clinical as he made birdies at the second, fourth, sixth, ninth, 11th, 13th and 15th.
It was not just Mickelson's driver that was working.
"If you don't score well out here you put yourself kind of behind a bit and it's tough to make up when we got weather coming in because you're trying to force it", Spieth said.
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The 38-year-old is making his third start at the Pebble Beach Pro Am when he would usually still be on a break in Australia.
Nine players were a single shot back on five under, including South Africa's Branden Grace, who played the Pebble Beach course.
Most of the big names on Thursday were at Monterey, where Australian Jason Day matched Mickelson's 65, while Americans Dustin Johnson and Jordan Spieth fired 66.
"I was really surprised he could say that", said Choi, who needed a translator to share that.
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