Summarize and humanize this content to 2000 words in 6 paragraphs in EnglishThe event’s quick-footed and eager “Ball Crew” regularly enthrall the crowds as they zip across the famous blue arena between every serve and volley to scoop up balls discarded by the likes of Naomi Osaka and Carlos Alcaraz.
Meet the ballkids breaking a sweat on the court during the US Open — and they don’t even have rackets
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