Samantha Stosur advances in Japan
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The top-seeded Stosur, whose win last year was her first WTA singles title, needed only 63 minutes to improve to 7-0 at the event.
Stosur won the first eight games of the match before Namigata got on the board.
Maria Kirilenko of Russia retired after dropping the first set 6-4 to Chang Kai-chen of Taiwan.
Copyright 2010 by The Associated Press
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