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The start of the U.S. Open men's final between No. 1 Jannik Sinner and No. 2 Carlos Alcaraz on Sunday was pushed back by a half-hour because of extra security, and President Donald Trump was greeted with a mix of cheers and boos from early arriving spectators when he waved from an Arthur Ashe Stadium suite. Here are five things to know about the historic Arthur Ashe Stadium.

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Increased security checks at entrances to the grounds and, separately, to get into the arena building prompted the U.S. Tennis Association to announce that the final would begin at 2:30 p.m. EDT, instead of the originally scheduled 2 p.m., “to ensure that fans have additional time to get to their seats.” At 2

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