Bean, who matched the course record Friday with a 9-under 63, is an 11- time winner on the PGA Tour, but has yet to win in almost three seasons on the senior circuit.
The only other time Bean, 53, has Bean held a share of the 36-hole lead -- at the 2004 Farmers Charity Classic with Bob Gilder. That time, he fell ill on the driving range due to something he ate, was taken to the hospital and was forced to withdraw.
Doyle, who won his second consecutive U.S. Senior Open title this summer, had a 6-under-par 66. He is alone in second place at 9-under 135, one stroke better than Tom Kite (68), R.W. Eaks (67) and Champions Tour rookie Chip Beck (69).