Tiger Woods had just hit a brilliant shot from the trees on the 14th hole, setting up a birdie putt that would pull him squarely in contention for his first Masters title since 2005.
Day appears to have overcome the back problems that plagued him during the opening round, shooting a five-under-par 67 to move to seven under for the tournament. It moved him briefly into the outright lead at minus eight, before a sloppy bogey at the 16th dropped him back to seven under.
Day and Scott were joined in the clubhouse lead by British Open victor Francesco Molinari (67), Brooks Koepka (71) and Louis Oosthuzien (66).
They were offset by two birdies to leave him one back on five-under, alongside Australian Jason Day.
Three-time champion Phil Mickelson, bidding to become the oldest major victor in history at the age of 48, is third on five under, while 43-year-old Englishman Ian Poulter is joint fourth alongside world number two Dustin Johnson on four under.
Both remaining Aussies also made the cut, with Marc Leishman carding his second consecutive 72, while Cameron Smith was +2 for the day to finish at even par.
Woods has gone 14 years since he last won the green jacket, 11 years since his last major and had five surgeries - four on his back, the other to rebuild his left knee.
Day said he had his chiropractor working tirelessly on his back on Thursday night and Friday morning to get him ready to play through the injury.
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"The Masters, how big it is and the distraction of wanting to win this tournament so bad, it [the back injury] is nearly a blessing in disguise". He was forced to withdraw from the Arnold Palmer Invitational in March after six holes and an MRI later revealed a disc tear.
DeChambeau, in a group that includes Johnson and Australian Jason Day, will set off at 10:42 am followed by a threesome that includes Mickelson and British world number one Justin Rose who has work to do if he wants to make the cut after a disappointing three-over 75.
"How can you compare Tiger Woods to Jack Nicklaus?"
He carded six birdies, three on the first nine and three on the second, finishing with a 4-under 68.
"It was fun", Woods said after the round, before saying he was confident on how he was striking the ball ahead of the weekend. The shot was pure, hooking around the pines to the green.
"Three [majors] in a row, I've been right in the mix", Woods added, building on his second place at last year's PGA Championships.
In an attempt to stop the crowd from bunching too close to golf's biggest drawcard, security personnel scrambled to maintain some kind of cordon.