NEW YORK — For much of the year, the Billie Jean King National Tennis Center in Queens is mostly quiet. But for two weeks late in the summer, the place becomes the center of the tennis world as hundreds of thousands of fans flock to Flushing Meadows for the U.S. Open.

Qualifying matches are already underway, and the main draw of the U.S. Open begins Sunday. The Australian Open, French Open and Wimbledon Championships are in the books, so this is the last chance for the world’s top tennis players to win a major title this year.

A few are favored to win this year, but the U.S. Open has been known for upsets and thrilling matches that can sometimes run past midnight.

Here’s what to know about this year’s U.S. Open, including one exciting change before the tournament officially starts, duri

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