DUBLIN, Ohio -- Joaquin Niemann could figure out where Tiger Woods was on the golf course from the mass of people following him a few groups ahead, and he had a pretty good idea what he was doing from all the noise, at least before Woods put a putter in his hands.
"There was so many people," Niemann said.
The few who stuck behind for the 19-year-old Chilean saw another good show at the Memorial Tournament.
In his fifth start as a pro, Niemann finished with two birdies over his last three holes for a 4-under 68 and a share of the lead with Kyle Stanley, who had a 66. He finished with an 8-foot birdie on the 18th hole.
Woods shot a 67 and was six shots behind with nearly two dozen players in front of him.
Stanley, who won the Quicken Loans National last summer, was atop the leaderboard for much of the day and was starting to pull away until a poor tee shot at No. 6 led to bogey. He finished with a par save from just off the ninth green and reached 11-under 133.
On the other side of the course was Niemann, the No. 1 amateur in the world and Latin American Amateur champion who wanted to play the Masters before turning pro. He looks his age when his braces shine every time he smiles. He plays beyond his years.
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 founded, and he doesn't appear to be the least bit nervous about being there.
"It feels really nice to be on top of the leaderboard," he said. "It does feel really nice for tomorrow."
Byeong Hun An had a 67 and was two shots behind.
Among those three off the lead were Hideki Matsuyama (71), who earned his first PGA Tour title at the Memorial three years ago, and Jason Day, a former world No. 1 who is a member at Muirfield Village and has never come close to winning. Perhaps this is the year. Day had never been within five shots of the lead going into the weekend at the Memorial, and he's not sure why.
"I think I just [stunk] on it for a long time," Day said. "I don't think there was anything, any reason why. I just didn't really play well. But I'm hopeful I can change that because I feel different this year.
"I want to play well in front of my family," he said. "Family and friends come out and I want them to be yelling in the crowd when I'm in contention."
Johnson and Rose each have a chance to get to No. 1 in the world. Justin Thomas, in his debut at No. 1, overcame a pair of early bogeys for a 69 and was at 3 under.
Rory McIlroy made bogeys on both par 5s on the front nine as he tried to finish strong. He had to settle for a 70 and made the cut on the number. That was still better than Jordan Spieth, who finished bogey-bogey for a 72 and missed the cut by three shots.
Since his closing 64 at the Masters, Spieth has finished at least 12 shots behind the winner in his three tournaments and missed the cut in his final event before heading to Shinnecock Hills for the U.S. Open.