The real question is the stakes, and the level of competition, and over a week at the All-England Lawn Tennis Club it was clear that a high-level field was playing for keeps.

WSJ: 2012 London Olympics: Andy Murray Vanquishes His Doubters

The only big film opening this weekend (in 2, 700 theaters) is Playing For Keeps which stars Gerard Butler as a washed up soccer player who returns home to try and become a man.

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Folks, these guys are playing for keeps.

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But they are playing for keeps.

FORBES: 11 Stellar Tools To Keep New Year's Resolutions

This urge to improve is a key ingredient in the formula, if there is one, for what keeps people playing a game.

NEWYORKER: Master of Play

I've never wanted to stop playing or quit for a single moment, because I truly love golf, and this is what keeps me going.

CNN: Interview with K.J. Choi

I'm sorry for him, but he's going to be in the top five very soon if he keeps playing like this and he has a good chance of winning Wimbledon.

BBC: Brutal Nadal sweeps aside Murray