World No. 2-ranked Victoria Azarenka on Tuesday withdrew from the Dubai Duty Free Tennis Championships due to injury.
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World No. 1 Victoria Azarenka didn't lose a game Thursday at the Qatar Total Open but Serena Williams pulled within one win of taking the rankings' top spot.
Top-seeded Victoria Azarenka and No. 4-seed Agnieszka Radwanska had clear wins Wednesday in second-round matches of the WTA's Qatar Total Open.
Jana Cepelova and Daniela Hantuchova each logged a reverse singles victory Sunday, boosting Slovakia over Serbia and into the Fed Cup semifinals.
Daniela Hantuchova of Serbia beat Bojana Jovanovski in Saturday's second singles match to even the Fed Cup series against the Slovak Republic 1-1.
With top Serb players out, Fed Cup rookie Vesna Dolonc is being called on to play three matches for Serbia in a series versus the Slovak Republic.
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No. 2-seeded Maria Kirilenko used a straight-set win Friday to advance to the semifinals of the WTA's PTT Pattaya Open in Thailand.
Two-time defending champion Daniela Hantuchova was defeated during her second match Thursday at the PTT Pattaya Open tennis tournament in Thailand.