Several other big names are scheduled to begin their third round within the next hour, including Tiger Woods, Dustin Johnson, Adam Scott and Brooks Koepka.Patrick Cantlay was one of the big movers so far during the third round.
Woods would go on to birdie the hole, so the effect of the slide wasn't immediate.
Woods missed an eight-foot birdie putt to par 17 and missed a 14-footer for birdie at 18.
McIlroy got his round under way with a ideal drive and an approach to 25 feet but left his birdie putt inches short and then strangely opted to hit a three wood off the tee on the par-five second.
"The last three majors, I've been right there", Woods said.
"Obviously we're not going to have any side action today because I'd probably see like.06 percent if I did win", Mickelson said in the video. "I'm like, 'It's 10 off the lead and 60 right?' He goes, 'No, it's 50.' And I'm like, 'Well, good thing I probably didn't know that"'. The Italian played a bogey-free round, finishing with a 67.
Woods, seeking a first major title since 2008 and a first win at Augusta since 2005, parred the first four holes and bogeyed the newly-lengthened fifth for the third day running to fall four shots off the pace.
The 29-year-old was eight shots off the lead as he signed his card, but low scores were the order of the day and the four-time major victor was certain to be too far back to mount a challenge on Sunday.
Day defied crippling back pain to be in contention after the first round - somehow posting a 2-under par 70 to finish day one just four shots from the lead despite aggravating his chronic back injury and needing medical treatment just five shots in.
Woods had just recorded the first birdie of the day on the daunting 11th hole and fired a superb tee shot to five feet on the 12th when the siren sounded to suspend play due to the threat of lightning at Augusta National.
But he feels he's getting closer. After a flawless opening round, Koepka had two bogeys and a double in his first six holes on Friday but the twice U.S. Open champion was able to regain his composure, steadying himself with six straight pars from the ninth.
His five putts made from beyond 20 feet over two days are two more than any rival. "Hit some quality iron shots and when I missed I missed them in the right spot". "This is the best players in the world on the biggest stage that we all want to be in so badly".
"It was good, pretty solid, not many mistakes and when I missed greens I missed them on the good side, leaving myself pretty easy up and downs so all in all a very good day", Molinari said.
He shot rounds of 75 and 73. He still was within four shots, along with Justin Thomas, who had a 68. McIlroy played the par 5s in even - two bogeys, one par and an eagle on No. 8 that got him under par, but only briefly.