Ryan Palmer shot the low score of the second round, firing a 62 on Friday to join a three-way tie atop the 36-hole leaderboard at the AT&T Byron Nelson in Texas.
The 45-year-old American, who last won an individual PGA event in 2010 at the Sony Open in Hawaii, was flawless in his 10-birdie, bogey-free performance that shot him up to 15-under at TPC Craig Ranch.
In a field where 19 players are at 10 under or better through two rounds, Palmer is tied with England's David Skinns - who carded a career-low 63 on Friday - and first-round leader, Sebastian Munoz of Colombia, who scored a 69 one day after making PGA Tour history with a blistering 60 in his opening round.
Tour rookie Justin Lower sits in fourth, his best position after any career round, one stroke back after a second-round 66. He is followed by South Africa's Charl Schwartzel (65) at 13 under.
Three players are tied for sixth, a mere three strokes off the lead, Justin Spieth (65), Chile's Joaquin Niemann (65) and the defending champion K.H. Lee (68) of South Korea.
Palmer, a native of Amarillo, Texas, began play on the back nine and ignited with a six-birdie stretch over seven holes, starting on the par-5 12th hole.
He finished with a flourish with another four birdies on the front, holes 3, 5 and 6, as well as his final one of the day at 9. The round was one off his career best (61 in the second round of the 2015 Humana Challenge).
"Today was a matter of knowing you had to shoot low, put up a good number just to stay within striking distance," Palmer said. "You never know when you're going to catch lightning like that, and to make 10 birdies today is an awesome feeling, especially in front of some fans and some friends and family.
"So I love where we're at,
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