Are tennis balls yellow or green? Roger Federer enters the debate
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Why tennis balls are yellow -- or maybe green - CNN Style
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What colour are tennis balls? Roger Federer finally confirms if they're green or yellow - Mirror Online
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How tennis changed from white to yellow balls thanks to David Attenborough - Tennis365
What colour do you think these tennis balls are? - BBC News
What Color Are Tennis Balls, Yellow or Green? Roger Federer Knows
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Why are the tennis balls yellow and not green or red?
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Why Tennis Balls Are Yellow—or Maybe Green | Artsy
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