When we found out we were having twins, it was like one of those moments where you’re like: ‘Wow, I can’t believe it, it’s really happening again’,” Federer told The Daily Telegraph in his first interview since the boys’ birth.

“But I always felt that there was a chance. My sister Diana has twins: a boy and a girl. And my grandmother on my mum’s side was a twin apparently. So I guess that we jumped a generation.

“It is pretty extraordinary. But I don’t feel special because of it. In fact I believe that it’s more to do with Mirka, but the doctors might tell you otherwise.

“I can’t actually remember when we found out: for me, Mirka being pregnant, that’s the big news. And then, if it’s one or two, that’s secondary. Same with boys or girls, it didn’t matter this time. I would have been really happy to have another two girls, because I love my girls so much. It’s boys now, clearly, and I couldn’t be happier.”