"I said it's very difficult to win on a long golf course like this and I still stick to that.
"Tom Watson almost did it obviously on a little shorter golf course (The 2009 Open at Turnberry), Fred Couples can do it any given moment, and there's a few of us that might do it, too. It's going to happen sooner or later."
Langer, who won The Senior Open Championship in 2010 and is expected to try and regain the title at Royal Birkdale later in the year, had just one bogey and a solitary bogey in his round to remain on two under par.
That was five behind on-course leaders Jason Day and Brandt Snedeker as they came toward the end of their rounds.
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