Former Open champions Mark O'Meara and Tom Lehman both failed to build on their encouraging first rounds as they tumbled down the leaderboard on the second day at Muirfield.
The Champions Tour pair rolled back the years on the opening day, with 1998 winner O'Meara firing a superb four-under 67 before 1996 champion Lehman returned a 68.
But both slumped to three over at the halfway stage as O'Meara laboured to a 78 - one shot worse than compatriot Lehman - although both were inside the cut mark.
O'Meara, 56, struggled to the turn in 40 and bogeyed four of the last five holes, while 54-year-old Lehman double-bogeyed 15 and dropped further shots at 16 and 18 and failed to make a single birdie.
"It's pretty simple, if you don't hit it good in an Open Championship with the rough the way it is out there, you're going to make some bogeys," said O'Meara, who lost a ball at the sixth and ran up a double-bogey.
"The short game is key, you have to putt well. I did none of those well, that's why I shot seven over.
"I'm disappointed. I know I can play better than that. It's never fun having a poor round, especially off a good first round."
Lehman added: "I hit it way better on day one. I put the ball in position and made some good putts, and today I hit it in some really bad spots.
"But it's a four-round tournament, so I think we'll see where we finish at the very end. I think anybody can play well one day.
"I do think though, quite frankly, that the conditions we had on Thursday were so firm and so fast that experience does help. And I think there's an element of patience that really suits that kind of course we had.
"You've got to be unflappable, no doubt about it. So to get frustrated with the greens would have been counterproductive."