Tom Lehman had an eagle and five birdies on the first eight holes on the back nine, then bogeyed the par-4 18th for a 7-under 65 and a one-shot lead after the first round of the Champions Tour's Insperity Championship.
Fred Funk and Houston native Tom Jenkins were tied for second, and past winners John Cook and Bernhard Langer topped a large group at 68.
The 53-year-old Lehman, the player of the year last season after winning three times, has three top-12 finishes in six Champions Tour starts this year. He eagled the par-5 15th en route to his lowest score in nine tournament rounds at The Woodlands.
Michael Allen, coming off consecutive victories at TPC Tampa Bay and the Legends of Golf better-ball event with David Frost, opened with a 69.