After the advent of Open era tennis in 1968, the U.S. Open spent a decade trying to establish its unique Grand Slam identity. Peter Bodo, tennis historian and author of The Courts of Babylon documented the following changes:
The U.S. Open could not tout tradition like Wimbledon, and its grass courts were soon ripped away and replaced by green clay. But that surface lasted only three years. It was too comfortable for European or South American stars like Bjorn Borg, Manuel Orantes and Guillermo Vilas. It did not cater to Americans.
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