"I've had it since '99 so I've hit so many putts with it, my body just remembers it".
Tiger Woods had his lowest round since his last victory more than five years ago, an eight-under 62 with birdie chances on all but two greens and only one bad swing all day.
His eagle 3 at the par-5 ninth hole came after he had birdied seven and then for a third day running making a mess of the par-3 eighth hole, in taking a double-bogey after two earlier bogeys.
Closes with back-to-back bogeys for a 70. "This was the shot of the entire day, a three-iron from 230 (yards) and I just laced it up in the air", the 42-year-old said.
Xander said: "I feel like I'm sort of on a mission here". He had to make a fourth on Monday and Schauffele is hoping to get that.
OFICIAL: Sebastián Pérez, nuevo jugador de Pachuca
Mientras sus nuevos compañeros cenaban y se recuperaban, Pérez se probó la camiseta número 8. "En Pachuca empezamos de cero", finalizó Pérez .
"I made a few putts today", Woods told the Golf Channel. Give these pros a course this soft and they will go to town - and so they painted it red. The trick Friday, when the average score was 67.33, was to avoid wedges that spun too much to back pin positions.
McIlroy's 69 saw him fall six places to equal seventh on nine under, while Woods is tied for 12th.
Schauffele, hopeful that a victory will give US captain Jim Furyk reason to pick him for the Ryder Cup, stayed with Rose the whole way until his lone bogey on the 18th for a 67.
It's never easy to back up a low round, but overnight rain made the Aronimink Golf Club course even more susceptible to low scoring.
He is a 14-time victor on the Japan Golf Tour and finished fourth at the WGC-Dell Technologies Match Play and in a tie for third at the PGA Championship.
Day missed the cut in the Dell Technologies Championship in Boston last week but he remains projected to go to the Tour Championship in Atlanta later this month inside the top 10 on the season-long points standings. He was the PGA Tour rookie of the year last season after winning the Tour Championship for his second PGA Tour title.