The Billie Jean King National Tennis Center welcomed a lot of changes for this year's U.S. Open, including a 236,600-square-foot retractable roof on Arthur Ashe Stadium and an 8,125-seat redesigned grandstand stadium. There was also a farewell to Louis Armstrong Stadium, which will reopen in 2018 with a brand new 14,000-seat venue, also featuring a retractable roof.
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