Players have donned yellow ribbons in support and made significant donations towards the Lyle family trust that will help support his two young daughters.
He holed only one lengthy putt, the other four birdies coming from tap-in range, or close to it.
The four-time PGA Championship victor Woods ignited hopes among enormous galleries at the St. Louis course when he picked up four shots on his front nine.
"Honestly, I haven't hit it great, up to my standards, these first couple days", Finau said.
Koepka, who in June became the first man to win back-to-back US Opens since Curtis Strange in 1988-89, could become only the fourth player to win the US Open and PGA Championship in the same year, following fellow Americans Gene Sarazen in 1922, Ben Hogan in 1948 and Jack Nicklaus in 1980. "I know that that's in the bag".
"This golf course is stacked right now, and everyone is bunched", he said. "It's soft, it's gettable, and you can't just go out there and make a bunch of pars".
MAJOR MELTDOWNS. Jordan Spieth will nearly certainly have to wait at least another year to complete his career grand slam bid after a hot run up the leaderboard was destroyed by an eventful triple bogey.
Tiger Woods still has eleven holes left to play and sits at three-under par.
Despite the triple bogey, his round of 71 left him in a tie for third.
"I hit two trees to get out of bounds, and my tee shot hit the cart path to get over there, and it just was a flawless storm", Spieth said.
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"This organization obviously DOES NOT honor First Responders and the dangers they put themselves in every day". But, that wasn't the most pointed Tweet at the president from Jordan.
"The greens were getting fuzzy, they're getting slow, and I didn't hit the putts quite hard enough, " Woods said.
"I mean, it would be more-than-twice the thrill for me", he said, "but no matter who wins tomorrow, if that person has met Jarrod, they will have felt something with him passing this week".
Spieth wasn't the only player to have a triple bogey nightmare.
Back-to-back bogeys from the 14th saw Koepka's lead cut to one, before a two-putt birdie at the 17th doubled his advantage over Scott - who mixed six birdies with a sole blemish during his round. He rained his short irons on the downy greens for five birdies and was two strokes off the lead as he made the turn, setting off a chain reaction of noise across Bellerive.
"It was nice", Woodland told reporters. "It was nice to have that in my back pocket, been there in that same situation, and came out on top".
England's Wallace produced one of the most memorable moments of the tournament by claiming a "mindblowing" hole in one on the par-three 16th. His 68 leaves him 5 under and tied 21st.
"Best shot of my life probably. In front of a few thousand people on one hole, in front of Jordan", he beamed.
"I flushed it right into my zone". "For sure, it was the craziest round I think he's ever seen. So, yeah, special day for me today". Thomas is the defending champion and has won twice this season. "You're never going to win another golf tournament again".
"He's a cool dude and very good fun out there. I thought if I didn't pull it off and hit the tree, I'd be somewhere down into the trees and still be able to make five".
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