Defending champion D.A. Weibring and Wayne Levi were two shots back and Doug Tewell was alone in fourth with a 68.
Stadler leads the Champions Tour money list after capturing his last two tournaments. He got his round going Friday with an eagle at the par-5 seventh.
"I got off kind of shaky the first five or six," Stadler said. "But it's kind of what I've been doing. The days that I make some putts are the days I score well. I'm hitting it pretty good."
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