Roger Federer Loses Cool, Smashes Ball Into Crowd In Rare Meltdown

Was that Roger Federer or Nick Kyrgios out there?

Roger Federer, the greatest player in men's tennis history, has had a rare meltdown at the Nitto ATP Finals in London -- an elite, season-ending event for just the world's top eight (available) players.

The distinctly un-Fed-like moment came in a match which Federer, the world number three, lost 6-7 3-6 to Japan's Kei Nishikori, the world number nine.

The Swiss was issued a code violation for whacking a ball into the crowd at the end of the first set, and appeared uncharacteristically grouchy all night.

Yeah, it was just one of those nights, all right.

Fed just wasn't Fed. He was, however, fed up.

It's an oft-forgotten part of tennis history that Federer started his career as a testy, argumentative player in the manner of Nick Kyrgios before curbing his behavioural ways.

There's a lesson there for all of us.