What colour do you think these tennis balls are? - BBC News

Roger Federer weighs in on the debate as people are divided on whether tennis balls are yellow or green.

TIL tennis balls used to be black and white, but changed to yellow

We Can Thank Sir David Attenborough For High Visibility Yellow

What colour is a tennis ball – green or yellow?

Sorry, What ― David Attenborough Is The Reason Tennis Balls Are

Why Tennis Balls Are Yellow—or Maybe Green

Sir David Attenborough Is The Reason Why Tennis Balls Are Yellow

Why tennis balls are yellow is largely thanks to Sir David

You're looking for a lack of fluff': Why Wimbledon uses 55,000

The reason tennis balls are yellow is largely thanks to Sir David

Why Tennis Balls Are Yellow, Thanks To Sir David Attenborough