Mickelson is in a six-way tie for third place following his memorable 65, which saw the American star hit every single fairway for the first time since 1998. I may have done it before but I don't ever recall doing it.
Jason Day is snapping at the leaders' heels midway through the opening round at the Pebble Beach Pro Am.
Brian Gay and Scott Langley recorded 7-under-par 64s on the Shore Course at Monterey Peninsula Country Club www.mpccpb.org to take a one-stroke lead over six players after the first round of the AT&T Pebble Beach Pro-Am.
"I think that one of the rule changes that came about where you can fix some areas of the green that were caused by other players made a big difference in this tournament for everybody, because around the hole you can smooth out some of the spike marks and indentations".
The tournament, which sees professionals play alongside celebrities, is spread across three courses near the picturesque town of Carmel - Pebble Beach Golf Links, Spyglass Hill Golf Course and Monterey Peninsula.
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.
"I was even through five holes and then I made a nice little run".
"I have the honour to play all three courses here and, just because of such lovely 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.
"I putted very well, too", said the lefthander.
"If you don't score well out here, you put yourself 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.
Pebble Beach is a happy hunting ground for the 48-year-old, who has won the event four times.
Cody Gribble had a 6-under 66 at Spyglass Hill and Si Woo Kim had a 6-under 66 at Pebble Beach.
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. On his back nine, the 43-time PGA Tour champion tallied five birdies.