Question: The 1994 US Open was a tennis tournament played at the USTA National Tennis Center in a city that is the most populous city in the United States, that had a 2016 population of 8,537,673, that was distributed over a land area of what size?
Sentence (from "1978 US Open (tennis)"): It was also the first time the tournament was played on hard courts, as opposed to much of its history on grass and a brief stint, from 1975 through 1977, on clay.
Relevant evidence: No