These days, the Billie Jean King National Tennis Center in Queens is swarmed with fans and stars. For the rest of the year, the grounds are an oasis of calm.

These days, the Billie Jean King National Tennis Center in Queens is swarmed with fans and stars. For the rest of the year, the grounds are an oasis of calm.

A small part of the New York City tennis tournament is staged, miles away from the main action, at the gleaming Cary Leeds Center for Tennis & Learning in the Bronx.