Meanwhile, Denmark's Thorbjorn Olesen and American Kevin Kisner each fired a four-under 67 to grab a share of the lead after 18 holes of play, reports Efe.
In a striking similarity to his first round, Lahiri once again made his recovery on the back nine despite missed putts after rather disappointing front nines.
Ricky Fowler, Paul Casey and Patrick Reed are among seven players two shots back in a tie for eighth, and world No. 1 Dustin Johnson, Hideki Matsuyama, Jason Day, Louis Oosthuizen and Tommy Fleetwood are among the players tied for 15th at 1-under 70.
"I've been upset with how I've played in the majors so far in my career", he said.
So what's a good game plan for the world No. 2 heading into the second round?
Jordan Spieth, who shot a 1-over 72, said he couldn't "putt any worse than I did today". "One of the reasons I played so well here usually is there's no rough, and (now) there's some very severe rough".
"I can make up five shots in nine holes, let alone 36 holes", Thomas said.
The second round is scheduled to resume at 07:30 local time (11:30 GMT) on Saturday.
One of the good things of the day was that some of the things that I worked on with Vijay (Divecha) sir worked out, like attitude on the golf course. That should have got me better scores, because if you miss the green it is hard to chip at times. He didn't get as many opportunities as he wanted to showcase improvement in that area Friday because he spent a lot of time scrambling, hitting just 50 percent of the greens in regulation. I'm not real focused out there.
"I feel like I'm better prepared to be in contention over the weekend and have a chance to win".
This is where Fowler got his breakthrough PGA Tour win " and where he now hopes to capture that elusive first major championship.
Olesen made two bogeys during his round to go with six birdies, including a 27-foot putt at the 18th.
"Coming in with some short irons into these greens was definitely the key to the round". Earlier I had three-putted the 14th from around 25 feet. "I don't know how that would really affect the shots", Mickelson said. "I just need to make sure I get in the fairways first".
Justin Thomas: He's done it before - making a move on Moving Day at a major - when he shot a then-record-tying 63 in Round 3 at the U.S. Open in June. You have to be good off the tee and I've done that.
"On the range, I'm having some of the best sessions", Mickelson said.