If we just bought tennis balls out of a bin or in an open box, they would lose this internal pressure. But because they come sealed, they are as pressurized as the day they were made, ready to bounce.

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At the top of the list is the tennis ball design—substantially unchanged since the advent of pressurized balls in the 1920s—consisting of a felt covering glued to a hollow, air-filled rubber core.

Tennis balls leave marks on all surfaces, but they are practically invisible to the naked eye on hard and grass courts, although on grass, chalk can sometimes fly up if a ball lands on or close to ...