U.S. Open live chat: Nadal vs. Roddick

Andy Roddick and Rafael Nadal are set to battle it out for a spot in the U.S. Open semifinals. The match is scheduled second on Arthur Ashe Stadium, so come

Andy Roddick and Rafael Nadal are set to battle it out for a spot in the U.S. Open semifinals. The match is scheduled second on Arthur Ashe Stadium, so come back here to chat with Courtney Nguyen and the SI.com tennis team during the action.

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