The 42-year-old was seen wiping his face throughout the performance, evidently touched by Bocelli’s unbelievable vocals. Federer’s appearance was vastly different to when he decided to go on stage with Coldplay in Zurich earlier this year, though lead singer Chris Martin did give the tennis legend plenty of fair warning.

Speaking of when he received the message from the multi-award-winning artist, Federer explained: “It was I got the invitation from Chris Martin from Coldplay. He said, ‘Don’t you want to come up on stage tomorrow?’ I was in Zurich at the time I just came back from an Elton John concert. You know stuff you just do when you don’t have much to do anymore.

“I looked at my daughter and I told her, ‘Do you think I should be going on stage to do this?’ And she was half-asleep, but told me, ‘Of course, papa, you only live once.’ Of course, I enjoyed it after. But, you know, I don’t need those anxiety moments anymore. I’m just happy and quite content to be away from it all, but I finished on top, you know, this is my music career. I ended it right there, I dropped the mic.”