Mark Wiebe of the United States shot a 5-under 65 Friday to share the lead with Bernhard Langer after the second round of the Senior British Open at Royal Birkdale.
Wiebe had four birdies on the back nine. Langer, the 2010 champion at Carnoustie, shot a 67 and made five birdies. Both players finished at 5-under 135.
The German dropped two strokes at No. 6 when he double-hit the ball.
David Frost of South Africa (68) finished third.