Green or Yellow, What Colour Is a Tennis Ball?

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I always thought it was green, but then I came across a poll of nearly 30,000 participants. The poll was old, but it sure was intriguing.

In that poll done on social media, 52 per cent said a tennis ball is green, but a large percentage, 42 per cent, said it's yellow, and 6 per cent went with "other".

Wikipedia says tennis balls are fluorescent yellow at major sporting events, but in recreational play can be virtually any colour.

The official site of the International Tennis Federation (ITF) states that historically, balls were either black or white in colour, depending on the background colour of the courts.

But in 1972 the ITF introduced yellow tennis balls into the rules of tennis, as research had shown these balls to be more visible to television viewers. Hence, the ball is yellow. But they don't look so.

A fan once asked tennis legend Roger Federer what colour tennis balls are. "They're yellow, right?" Federer said.

We should believe what the legend says. But even that can't put an end to this fierce debate. So what do you think? What's the colour of tennis balls?