On the first extra hole, DeChambeau was the only player in the fairway and missed the green to the right. He made the turn in 33 with a 15-foot birdie putt on No. 9, and then he made a solid escape from the rough and trees on No. 11 before holing out for eagle.
"It was a little 7-iron, tracked it basically the whole way and fortunate to have it go in", he said. "But I'm in position where if I shoot another good round like I had the last two days, I've got a chance".
For the week, Woods made just one birdie over the closing three holes and played them in 3 over par.
"I know I shot 68 today, but again, that's probably the highest score I could have possibly shot", said Woods, who was five shots behind.
Few doubted that Bryson DeChambeau would eventually secure a breakout win and cement his status among the crop of elite young American players, alongside age counterparts like Jordan Spieth and Justin Thomas. He will keep that ranking going into the U.S. Open.
"I just want to birdie every hole", he said. "Overall, my game is where it needs to be heading into the U.S. Open, which is a positive".
Already with a pair of top 10s on the PGA Tour, Niemann now finds himself in the last group going into the weekend at the tournament Jack Nicklaus built, and he doesn't appear to be the least bit nervous about being there.
Kyle Stanley didn't have the same problem, rallying from five strokes down with five holes to play with birdies at four of his last five holes, a run that was only marred by a bogey at the last to finish tied with Dechambeau and An.
Day birdied three of his last five holes for another 4-under 68, leaving him tied for the early 36-hole lead.
Woods followed that up by hitting the flag with his tee shot at the par-3 12th, so he's looking pretty locked in right now. The resulting bogey left him part of the three-way playoff. A bogey at the opening playoff hole (No. 18), eliminated Stanley. "Then for the most part my ball striking was good".
An almost got away with his mistake on the second playoff hole, which he pulled into the gallery.
Despite a hard lie in the rough and the downhill nature of the green the former U.S. Amateur champion hit a wonderful shot to close range. He finished with an 8-foot birdie on the 18th hole.
Ironically it was the same putt An had in regulation that would have won the tournament.
"The scary thing is, as well as he's hitting the ball, he's not putting well", Reed said. "I don't think there was anything, any reason why". The field features eight of the top 10 in the world.
He will now be able to accept unlimited sponsor invites for the rest of the season as he looks to earn enough non-member points to earn a TOUR card for next season.