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

Shaun Botterill/Getty Images

• 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.

David Vincent/AP

Well, now the greatest men's tennis player of all time has chimed in on the subject.

Twitter user Delany Dold posted a video of her father asking Federer what color tennis balls are.

"They're yellow, right?" Federer said.

To be fair to the greenists out there, his answer did sound like there was a little doubt in his mind. Then again, he might have just been surprised it was a question at all.

While Federer says the balls are yellow, others disagree with the greatest men's tennis player ever.

In a recent less-than-scientific Twitter poll (via The Atlantic), 52% of nearly 30,000 respondents said tennis balls are green, and only 42% of the voters said yellow, with the rest voting "other."

People on Twitter were quick to note that they are right, and people who disagree are wrong.

Tweet Embed:
//twitter.com/mims/statuses/976132096015110145?ref_src=twsrc%5Etfw
Tennis balls are green. Why is this a question. Roger Federer is wrong. https://t.co/R93wElqjAq Tweet Embed:
//twitter.com/mims/statuses/970686635594604544?ref_src=twsrc%5Etfw
People who think tennis balls are green > people who think tennis balls are yellow

But the yellow camp was not going down without a fight.

Tweet Embed:
//twitter.com/mims/statuses/976191644876853249?ref_src=twsrc%5Etfw
The same people that think tennis balls are green think that hotdogs are sandwiches. https://t.co/xYW4EjDkhx Tweet Embed:
//twitter.com/mims/statuses/976130453299253248?ref_src=twsrc%5Etfw
I'm all for free speech, but if you think tennis balls are green, you need to be removed from the gene pool https://t.co/6jQLxBxQTx

To be fair, some people do feel passionate about the hot dog/sandwich debate.

Others tried to use logic.

Tweet Embed:
//twitter.com/mims/statuses/976366438616322048?ref_src=twsrc%5Etfw
If tennis balls are green how come you can see them against the green grass? They are yellow, end of discussion ]]>🎾