After the tournament, Attenborough suggested switching to a fluorescent ball to improve visibility for viewers. The ...

But, according to the book 2,024 QI Facts To Stop You In Your Tracks, at some point, David Attenborough noticed that the ...

Those used initially were black or white, depending on the background color of the courts, according to the International Tennis Federation (ITF). The ITF then changed the color of the balls in 1972.

Thus, until the 1970s and for almost a century, tennis balls were white or black. Today they are yellow, although some recalcitrant still speak of 'green'.