Tennis star Nick Kyrgios left listeners stunned with some bizarre comments during his appearance on social media star Logan Paul’s podcast.

During his tell-all appearance on the ‘Impaulsive’ podcast, Kyrgios revealed his “mad” interest in conspiracy theories, more details about his private life with girlfriend Costeen Hatzi, his mental health battles, his time spent in court and how close he came to retiring from tennis last year.

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Kyrgios, who admitted to being a “massive conspiracy guy” was asked if he thought the world was flat to which he smiled and replied, “I don’t know what to believe anymore.”

But he did go into further detail when discussing the pyramids.

Nick Kyrgios and the pyramids of Egypt Credit: Instagram / Getty Images

“I don’t think the pyramids are man-made,” he said.

“The doors are pretty big, and we as humans don’t need doors as big as those ones.”

Paul agreed: “How do they line up in perfect symmetry all around the earth?”

They also cast doubt over the moon landing with Kyrgios saying, “America weren’t apparently even close to having anything successfully going up there, right?”

In a wide-ranging interview, Kyrgios admitted that his girlfriend Costeen Hatzi “gave him confidence” and was a big support during his career.

“I don’t think I listened to her, but she gave me confidence. Things like that, just being present, saying things like, ‘You’ve got the talent here, you can actually go this far’.”

The 27-year-old said “tennis is brutal” and for him to win a grand slam, therefore winning seven matches in the space of two weeks, is “almost impossible”.

“It’s tough because you play four or five hours and then you have one day off and then you have to do it again,” Kyrgios explained.

“And then that’s seven times in a row to win a grand slam, so it’s almost impossible.”

Nick Kyrgios and Costeen Hatzi. Credit: Instagram/Costeen Hatzi

Speaking about his 2022 Wimbledon final loss to Novak Djokovic, Kyrgios said that was his best chance to win a grand slam and he would have retired from the sport had he won.

“That was my chance. That was really my chance. If I’d honestly won that, I think I would have retired at least for a year or two,” Kyrgios said about the loss.

“I think I can win a grand slam. Wimbledon I was right there. I was two sets away. I won the first set and I thought this is it. And then I just didn’t stay in the moment and he stayed super composed.”

Kyrgios said if he was to eventually win a grand slam, it would be more for “the haters” and not for himself.

“I feel like I could do that. It’s weird, but I feel like it’s not even for me though. I feel like it’s for everyone else,” Kyrgios said.

“All the haters as well. I could finally just rest. I could just go home and sleep in my bed and not deal with the s***.”

During the podcast, filmed in Sydney last week, Kyrgios said he has battled mental health problems during his career and there were times a few years ago when he was drinking “every day of the week” — even in the middle of tournaments.

Fan invades pitch to attack Spanish goalkeeper during Europa League match.

Fan invades pitch to attack Spanish goalkeeper during Europa League match.