World Cup soccer: The thing that can make Roger Federer nervous

We’ve seen Roger Federer in countless big-time tennis matches, and very rarely — perhaps never — has the word "nervous" been used to describe him on the court.

Well, we now know what it takes to crack the facade.

Federer tweeted out a picture of himself watching his home country, Switzerland, compete Tuesday in the World Cup. The Swiss were playing in a round of 16 match against Argentina after advancing out of the group stage.

The result? A curled-up-in-a-Minnie-Mouse-blanket, on-the-edge-of-his-seat portrait to remember:

Switzerland and Argentina went into extra time but the Swiss ultimately fell to Messi and the Argentines, 1-0.

Ever the sportsman, Federer tweeted this shortly after the game ended: 

Earlier in the day, Federer dispatched Tommy Robredo in straight sets to reach the quarterfinals at Wimbledon for the 12th time in his career.