Well, at least we know there's something Roger Federer can't do.
Fresh off the court from defeating Kei Nishikori in five sets, the former world No. 1 looked to be expecting a cruisy post-match interview in front of thousands of fans. What happened was quite the opposite.
Channel Seven commentator JimCourier outed Federer's singing skills to the world, sharing a video of the 35-year-old champ singing with fellow tennis players Grigor Dimitrov and Tommy Haas on Twitter with the packed Rod Laver Arena.
Federer's singing left a lot to be desired, with Courier stopping the video short.
"We can wrap, that's enough. That's enough. We've got enough," he said.
"Oh God. I didn't even know that song that well. I have heard it many times, the lyrics are not my things. That's why I think my voice was playing up a little bit."
Federer will now play Mischa Zverev - who caused a massive upset defeating Andy Murray - in the quarterfinal round.
