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:
Slightly nervous #switzerland pic.twitter.com/G7xh7s6G6q
— Roger Federer (@rogerfederer) July 1, 2014
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:
So rough, congrats to Argentina! Thanks for all the moments #switzerland
— Roger Federer (@rogerfederer) July 1, 2014
Earlier in the day, Federer dispatched Tommy Robredo in straight sets to reach the quarterfinals at Wimbledon for the 12th time in his career.