We can't say it all started with Boston Celtics star Kyrie Irving,  but he seems to have been the first famous athlete to come out and admit that he believes the earth flat. After Irving came out back in February and shared his beliefs as a flat-earther, other professional athletes followed suit.

Here is a list of five athletes that are known flat-earthers.

5. Kyrie Irving

Of course, we will start with Kyrie Irving, who came out and revealed his beliefs during the 2016-17 NBA season while he was still a member of the Cleveland Cavaliers.

Below is a video of Irving speaking out for the first time on the topic.

Here are some quotes from Irving during an interview on a podcast that was conducted in February of 2017.

“For what I’ve known for many years and what I’ve been taught is that the Earth is round, but if you really think about it from a landscape of the way we travel, the way we move and the fact that — can you really think of us rotating around the sun, and all planets align, rotating in specific dates, being perpendicular with what’s going on with these ‘planets’ and stuff like this.”

“Everything that they send [to space] doesn’t come back. It doesn’t come back. There is no concrete information, except for the information that they’re giving us. They’re particularly putting you in the direction of what to believe and what not to believe, and the truth is right there. You’ve just got to go searching for it. I’ve been searching for it for a while."

We would love to sit down with Irving and have him lay out why he believes what he believes.

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4. Jaylen Brown

With Irving now a member of the Celtics, it looks like his beliefs have rubbed off on young Boston forward Jaylen Brown.

Brown isn't ready to say he completely believes that the earth is flat, but it sure sounds like that's the way he's leaning right now after talking to the media just six days ago. Just watch the video below.

Brown was the third overall pick of the 2016 NBA Draft. He's now heading into his second season.

With Brown only being 20 years-old, him being influenced by Irving wouldn't be a surprise.

3. Stefon Diggs

Minnesota Vikings star wide receiver Stefon Diggs was one of many athletes to respond to the criticism surrounding Irving after his flat earth comments. He made it clear that agrees with him.

Diggs posted a tweet that read, "How mad would you guys be if I said I agree with Kyrie? Well don't care."

It looks like Diggs is certainly team flat earth.

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2. Draymond Green

Golden State Warriors star Draymond Green wouldn't say he believes the earth is flat, but he also isn't convinced that it's round. We get the feeling that he was afraid of the backlash he might receive for agreeing with Irving.

“It’s just his opinion — it’s hard to call someone’s opinions crazy,” he said. “That’s just what he thinks."

Here's a video of Green talking about Irving.

1. Sammy Watkins

Rams wide receiver Sammy Watkins, who was just traded to the Rams from the Buffalo Bills this past summer.

There are so many people in this world that believe in things like the earth being flat. Of course, having the ability to watch pretty much anything on YouTube, it could be easy to be influenced into believing such a thing.

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Sports Illustrated posted an article back in March explaining why athletes are drawn to the theory of the earth being flat. While you can read the article for yourself, it pretty much says that there are many different reasons why athletes believe the earth is flat, just like many normal people share the same belief.

Comment below and let us know whether or not you believe the earth is flat. And what do you think of some of the world's most famous athletes believing that the world is flat?