The roof now closed because of rain, Djokovic, by now taking an age to deliver each serve, dug deep to hold his next service game, but Berdych's double-fisted backhand was beginning to yield results.
BBC: Novak Djokovic makes short work of Berdych in Melbourne
The system he created and the worlds that came out of it are deep, interesting and serve as valuable tools for people to learn many different things about themselves, their lives and the reality.
Critics warn that many of these new developments will only serve a tiny elite, exacerbating an already deep divide between the haves and have-nots.
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The second set went with serve, but 16th seed Li again dug deep to save three match points in the 10th game and another at 5-6 to force a second tiebreaker.
"Recent developments in the U.S. wireless industry serve as a direct reminder of the key strategic role deep spectrum resources and a global LTE ecosystem will play in the long-term success of any 4G mobile broadband operator, " said Erik Prusch, President and CEO of Clearwire.
While nation-building under fire certainly isn't a Peace Corps mission, I saw enterprising Peace Corps volunteers make a deep impact on the communities where they were invited to serve.
Stephens did not make the best possible start as Williams went one set and a break of serve ahead, before the 19-year-old American dug deep to pull out an unlikely triumph.
Extending a tiebreak that deep requires fierce mental tenacity (and usually, a big serve) and a player unmotivated to stay in London would be flushed out fast.
WSJ: 2012 London Olympics: Andy Murray Vanquishes His Doubters
In addition to the desire to serve your country, you seek what many of us sought, the bonds of deep friendship that often come from military service.
Facing deep cuts to their budgets, the best local authorities have radically rethought how they ought to serve the people who elect them.
ECONOMIST: Innovation in government: Britain��s local labs | The
The differences between a company like Amazon and a small specialty player illustrate the disparities between a market-share model, designed to serve as many products to as many people as possible, and a customer-focused approach aimed at developing deep loyalty from shoppers, according to Kahn.
FORBES: Many-stop Shopping? How Niche Retailers Are Thriving on Internet 2.0
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