"When everyone is playing well you can feed off each other, and I think we did a good job of that today, saw a lot of putts go in," he said. "Everyone played well, and hopefully we'll have more of the same tomorrow."
Jimmy Walker and Tim Herron were five strokes back. Walker had a 66, and Herron shot 68.
John Daly, tied for sixth at 10 under after a season-best 63 on Friday, had a 15-over 86 to drop to last among the 72 players who made the cut. He had a quadruple bogey, a triple bogey, two double bogeys, six bogeys and two birdies in his worst round of the season.
"I can't remember a time when I had a stretch of so many bad holes, where I hit a couple bad shots but didn't really hit that many bad shots. This course, everybody shoots it low, but there's times where nothing just goes right. I short-sided myself all day. If I missed a green, I had the most impossible chips. I couldn't make a 4-footer today, and I had the lefts going. Usually if I miss the ball, it's right, so that confused me a little bit. It's almost you get off to a start like that, your body just almost goes into shock, and every time I tried to hit a cut, I'd hit a pull, and every time I'd try to hit a draw, I'd flare it right."
At 132nd on the money list, the two-time major champion is trying to move into the top 125 to secure full playing privileges for next season.
"It's just a rough day," Daly said. "Just a tough day."
De Jonge wasn't worried about dwelling on his lofty position on the leaderboard.
"No, in Vegas, I definitely won't be thinking about the tournament," de Jonge said. "There's a lot of other stuff to do in this place. It won't be hard to get away from it all. That's what's nice about playing a tournament in a place like this. It's very easy to get away from golf once you're done.