John Cheever’s “The Country Husband”
John Updike’s “The Happiest I’ve Been” (New Yorker subscription required)
J. D. Salinger’s “A Perfect Day for Bananafish”
Herbert Gold’s “Death in Miami Beach”
John Barth’s “Lost in the Funhouse”
Delmore Schwartz’s “In Dreams Begin Responsibilities”
The links are to the stories online if I could find them. As far as I can recall, the one by Salinger is the only one I've read. I read a book of his short stories late last year.