The internet is battling over whether tennis balls are yellow or green — and Roger Federer has the definitive answer

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• The internet can't seem to agree about the color of tennis balls, with some arguing they are yellow and others swearing they are green.
• While some have compared it to the famous internet dress, it's more similar to the argument over lemon-lime Gatorade.
• Roger Federer was asked by a fan, and the greatest men's tennis player ever said they are yellow.

We have all looked at tennis balls millions of times, but most of us have never considered one of the most basic questions until recently — are they yellow or green?

The answer may seem obvious to most. But whether you think the balls are yellow or green, it can be a bit of a shock to find out that there are people out there who see them differently.See the rest of the story at Business Insider

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• The normally mild-mannered Roger Federer argued with an umpire and smacked his racket on the ground before crashing out of the Indian Wells final
• Will Ferrell gate-crashed the commentary booth for a Roger Federer match and wreaked havoc

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