He did just that over the first nine holes, making five birdies on the front nine on the way to a 31 that drew him within two of the lead.
He lost a stroke on the next hole, though, dropping his first bogey of the day on No. 6.
Thousands of spectators watched Woods sink a 17-foot birdie putt on the first hole and drop his approach to four feet setting up a birdie at the second.
After completing his storm-delayed second round earlier in the day, Woods thrilled the galleries at the Bellerive Country Club by ripping through the first nine holes in just 31 shots to move within two shots of the lead.
ST. LOUIS - Who knows what time Tiger Woods woke up on Saturday morning, but like all of those who had to finish the second round, it was in the dark.
Resuming on the second hole, his 11th of round two, the flawless golf continued from the former Irish Open victor who started with a par and followed it up with his fourth birdie of the round on the par-three third (his 12th). He certainly gets points for showmanship and a willingness to attract some eyeballs, but he doesn't quite get full marks for creativity; Brown said he remembered seeing another fan do something similar about a year ago, and decided this would be the flawless time to go for it.
"[On Saturday], I was in there with Dustin, and everybody wanted a picture with Dustin", Koepka said. "But I think that a part of everyone's playing for Jarrod out here this week".
But Woods could turn it only so far.
"It's not necessarily the physical, it's mentally grinding that hard for 29 holes in this heat, " he said. He finished with 10 consecutive pars. "I've made, what I thought might take weeks, kind of a turnaround to be able to trust and hit some really quality shots and work my way up a major championship leaderboard in the span of hours".
And the round was solid, perhaps something to build on.
British Open champion Francesco Molinari is in a three-strong group on seven-under, the Italian continuing the fine form he showed at Carnoustie last month.
The ball sailed right into the trees and hit a cart path, cannoning deep into the woods.
There, he needed some help from the leaders to make it interesting, and the same might be required here.
The crowds are already amped for what could be an historic Sunday and multiple golfers have noted that this is the most fans they've ever played in front of.
"I wasn't working the right things", he said. Look at that front nine.
The two Utah club professionals in the field each ended up at 5 over par, missing the cut. "All in all, we'll play aggressive and just stick to what we've been doing". It's soft, it's plugging, we're able to hold 4-irons, 5-irons, whatever we want, at the flags.
"With whatever is going on this week I'm not really thinking about it at the moment ... but certainly I think late in the day tomorrow if I'm in with a chance your levels of determination can lift so much and you just have to find something extra ... that could be a powerful thing".