Michael Allen shot a 4-under 67 on Saturday to take a five-stroke lead after the second round of the Champions Tour's Encompass Insurance Pro-Am.
Allen played the front nine in even par, then birdied the par-3 11th and made a 40-foot eagle putt on the par-5 12th. He finished with a birdie on the par-4 18th to reach 9 under at TPC Tampa Bay.
Allen won the 2009 Senior PGA Championship for his lone victory on the 50-and-over tour.
Bernhard Langer, Sandy Lyle, Corey Pavin and Olin Browne were tied for second. Langer and Pavin shot 71, Lyle had a 69, and Brown a 66.
First-round leader Bruce Fleisher struggled, shooting a 78 and to finishing at 1 over. The 63-year-old Fleisher shot a 65 on Friday.
Tom Watson dropped out because of an injured right hand. He shot a 77 on Friday.