Rookie Alex Prugh, making only his third appearance on the PGA Tour, and fellow American Jeff Quinney recorded matching 64s on the same Nicklaus layout.

Tour veteran JP Hayes launched his season in fine style with an eight-birdie 65 on the Palmer Private course, finishing level with fellow Americans Garrett Willis, George McNeill and Joe Ogilvie.

Willis started out on the Nicklaus layout, McNeill began at La Quinta Country Club and Ogilvie toured the Palmer course.

"It was just one of those rounds where everything kind of flowed together," Bertsch, 39, told reporters after compiling successive loops of five-under 31 in a flawless display. "I hadn't played the course since the late '90s. I didn't know really what to expect. I didn't do anything over-the-top great. My game was pretty solid all the way around."

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