"I wish I only had to worry about him", Molinari said of Woods. "I felt like I left a few shots out there".
Lurking one shot further back is twice U.S. Open champion Brooks Koepka, who scrapped his way to three-under 69 to trail Molinari by three.
"The safety of everyone on our grounds is paramount", said Fred Ridley, Chairman of Augusta National Golf Club and the Masters Tournament.
He poured in his birdie putt to jump to 5-under for the tournament. "I've been in the mix with a chance to win major championships in the last two years, and so that helps". "All of a sudden I'm here at the Masters".
They are all scheduled to tee off Saturday between 2:25 and 2:45 p.m.Tiger Woods, Dustin Johnson, Justin Harding and Xander Schauffele are all one shot back.
Then there's the man lurking one shot behind: four-time tournament victor Tiger Woods.
Tiger Woods had just punched out of the woods along the 14th fairway when a highly overzealous Georgia Bureau of Investigation security guard, determined to keep the surging patrons at bay, slipped and almost snapped Woods' ankle.
"It's been a while since I've been in contention here", Woods said.More news: Not enough health benefits in vitamin supplements, study says
More news: UK FM says he's against military rule in Sudan
More news: Sudan's Bashir ousted by military; protesters demand civilian government
"Accidents happen, we move on", he said.
But he missed a 5-footer for par at the fifth; three-putted the eighth to bogey a par-5; had it to 5 feet after an excellent approach at the par-3 12th and failed to convert.
The 36-year-old then found the heart of the 13th green in two and two-putted for birdie, knocked another sweet iron in close and converted the birdie putt at 14, and he did well to get up and down from just off the back edge of the 15th green for his sixth red number of the day.
The guard clipped Woods' foot and ankle, leaving Woods hopping away in pain before making his way to the green - where he pulled off a long putt to ice a truly remarkable birdie.
Oosthuizen made seven birdies in shooting a 66. Cantlay, who began the day nine shots off the lead, moved to within a shot of a group of leaders who had yet to tee off when he finished.
Seventh-ranked Molinari fired a bogey-free 67, the lowest score of his 26 career rounds at Augusta National, where his best finish was a share of 19th in 2012.
"I hit the ball a little less well than yesterday", Molinari said.
Scott, the 2013 Masters champion, eagled the par-5 15th to reach eight-under but a bogey at 16 dropped him back into the pack. "So I'm aware that it's not going to be easy tomorrow and, like I said, I can just do my best".