Roddick, Kuznetsova Advance

Andy Roddick moves to the quarterfinals after Tomas Berdych retired in the second set. It's the second time an opponent has retired against Roddick at the Open. Roddick has yet to drop a set and it's leading one to wonder: Could he give Federer a fight in the quarters?  

Svetlana Kuznetsova won easily in straights and advances to the quarters where she'll take on Agnes Szavay who also won today in straight sets. Aggie Radwanska is down a set against Israeli Shahar Peer in a fourth-round match at Armstrong.