Australia's Richard Green will play in the Open Championship after Woody Austin decided not to go to Carnoustie.
Austin and Hunter Mahan earned places in the field on Sunday through the mini-Order of Merit on the US Tour.
But the American said: "I don't know how to play that type of golf. I would probably go and shoot two high numbers and make a fool of myself."
Austin, 43, has played in the Open just once, missing the cut on the links of Royal Lytham in 1996.
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Green replaces him as the highest non-exempt player on the world rankings.
He is currently 39th, having on the Austrian Open last month - a week after the Open Championship cut-off point for the world's top 50.
Unlike compatriot Austin, Mahan will take his Carnoustie spot.
"Any time you can play in a major it's good and you get a little bit of experience," said the 25-year-old. "I've been there two years, it's a ton of fun, golf in its pure form.
"All I know about Carnoustie is just kind of what I've seen on TV. I'm going in there pretty fresh and will have to come up with a game plan."
Mahan finished 36th on his debut at Troon in 2004 and 26th at Hoylake last July.
Another American, Pat Perez, also qualified thanks to his third place finish in the AT&T National in Maryland.
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