Williams sisters, Wozniacki win
DOHA, Qatar -- Serena Williams became the first player to clinch a spot in the semifinals of the WTA Sony Ericsson Championships on Thursday, defeating Elena Dementieva 6-2, 6-4 for her third straight win in the tournament's round-robin group phase.
Her sister Venus, the defending champion, stayed alive by beating Svetlana Kuznetsova 6-2, 6-7 (3), 6-4 for her first win in three matches. She needs Kuznetsova to beat Dementieva on Friday to have a chance of advancing to the semifinals.
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