LAKE ORION, Mich. -

Bernhard Langer has surged into the lead at the U.S. Senior Open.

Langer shot a 6-under 64 on Saturday to move to 10 under for the tournament, putting him ahead by four strokes.

The two-time Masters champion opened with three straight birdies and eight in 12 holes. The 54-year-old Langer had a double bogey at 13 and a bogey at 18 to give the field a glimmer of hope on Sunday.

Tom Lehman and Corey Pavin were in a five-way tie for second at 6-under 204.

Fred Couples moved up the leaderboard with a 65. He was part of a pack, along with Fred Funk and Jay Haas, that was five shots back at the Champion Tour's fourth of five majors.