How to make a tennis ball

Jul 23, 2016 By Jake Brannon

Approximately 90,000 tennis balls are used in the U.S. Open tournament every year. But before they're smacked around the court by pros, they're made in an intricate Bangkok factory. Filmmaker Benedict Redgrove, who was commissioned by ESPN to document the process, was immediately struck by the beauty of how the little yellow balls are made.

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