From the didn't know that file. Reading a book in which it is stated the 1978 U S Open was the first to be held at the new Flushing Meadow site ( built at a cost of $10 mill, by the way). Because of the heat, and the new hard court surface, author wrote the early rounds were reduced to best of three. Hmm. Checked wiki. Concurred. Checked Sports Illustrated vault for the U S Open issue - with victorious Connors on the cover - mentioned the three set matches only in passing. Anyone have any more details?