Novak Djokovic and Andy Roddick will meet in the second round of the men's tennis competition on Tuesday.

Djokovic is the second seed in the tournament, while Roddick is unseeded. That doesn't mean Djokovic is overlooking the three-time Wimbledon finalist.

"Andy has one of the strongest serves in the world, ever, and it's his biggest weapon," Djokovic says. "The grass courts this year are very fast and it's a low bounce, so I think I will have to be on top of my game in order to win that match."

Roddick is back at the Olympics after skipping the Beijing Games. He knows it won't be easy to stay around London much longer against the powerful Djokovic.

"The guy has been the best player in the world over the last couple of years. It's going to be tough," Roddick said. "But the situation, we've both been through it a million times. I'm going to have to serve well and take some chances on returns."

— Christopher Torchia

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