Tennis balls used to be white until Sir David Attenborough realized they'd be hard to follow on color television so the sport created 'optic yellow' balls in 1972.
Tennis365, Tiny Fox Lab

Tennis balls used to be white until Sir David Attenborough realized they’d be hard to follow on color television so the sport created “optic yellow” balls in 1972. – Tiny Fox Lab Facts

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Source: tennis365.com/tennis-features…