Stomach injury knocks Serena out of season finale; virus befalls Ivanovic
DOHA, Qatar -- Serena Williams and Ana Ivanovic withdrew from the WTA's season-ending event on Friday, and top-ranked Jelena Jankovic advanced despite losing 2-6, 6-3, 6-4 to Vera Zvonareva.
Zvonareva and Jankovic both advanced to the semifinals of the Sony Ericsson Championships because of winning records in the round-robin stage of the tournament.
Zvonareva plays Elena Dementieva and Jankovic faces Venus Williams on Saturday.
Serena Williams pulled out with a stomach injury ...
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