DOHA, Qatar (AP) -- 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.
Earlier, Caroline Wozniacki overcame severe leg cramps and a tenacious Vera Zvonareva to win 6-0, 6-7 (3), 6-4.
WIMBLEDON, England (AP) -- When 
























