Langer, the defending champion, opened with consecutive rounds of 65, and a 67 on Saturday was enough to double his lead.
He was at 16-under heading into the final day of the third of the season’s five major championships on the over-50s tour.
Langer started the third day with a four-stroke lead and he remained four ahead at the turn.
A birdie at the 11th hole moved his lead on to five strokes and then a Cochran bogey one hole later extended his margin to six strokes.
Cochran???s bogey at the 16th widened Langer???s margin to seven strokes and when he holed a six-foot birdie putt at the par-five 17th, his lead matched Langer’s record margin of eight.
Last year at the Senior Open Championship at Royal Porthcawl in Wales, Langer also led by a record eight shots before winning by 13.
The German also went wire-to-wire in Wales and??has four senior major victories to his name after two, the 1985 and 1993 Masters at Augusta, while competing on the regular tour.
He has dominated the senior circuit since turning 50, winning the money title six of the past seven years and he and Scotland’s Colin Montgomerie have won five out of the last six senior majors.