There’s a riveting sideshow that happens on the courts of the Billie Jean King National Tennis Center during the US Open in Queens each year — and it has nothing to do with the famous players vying for the crown.

The event’s quick-footed and eager “Ball Crew” regularly enthrall the crowds as they zip across the facility’s famous blue arenas between every serve and volley to scoop up balls discarded by the likes of Naomi Osaka and Carlos Alcaraz.

There are 315 members of the agile work crew, and they range in age from 14 to their early 50s, according to team leader Neal Kitson. 10

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Each person is put through a rigorous try-out that tests their agility and speed for grabbing balls off the court in the middle of game play.

This year, there were only 80 spots for newbies open.

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