Sauers, seeking his first Champions Tour title, finished 36 holes at 8-under 136.
Meanwhile, overnight leader Mike Goodes ended the second round with sole possession of second place at minus-6 with a second consecutive 3-under 69.
Grabbing third place at 3-under was Loren Roberts, who also registered a 69 at The Woodlands Country Club.
Following two shots further back were Peter Senior (70) and Esteban Toledo (71).
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