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                  === Li stays alive at WTA Championships ===
 
 Istanbul,  Turkey  (Sports Network) - Former French Open champion Li Na won a
 round-robin match Thursday to keep her semifinal hopes alive at the season-
 ending WTA Championships in Istanbul.
 
 The eighth-seeded Chinese star improved to 1-1 this week with a 6-4, 6-3
 handling of fifth-seeded German Angelique Kerber, the German left-hander who
 went a disappointing 0-3 in her round-robin matches at Sinan Erdem Dome.
 
 Also on Day 3, world No. 1 Victoria Azarenka is battling third-seeded former
 top-ranked star Serena Williams and seventh-seeded Sara Errani will take on
 ninth-seeded Samantha Stosur, who replaced 2011 WTA Championships titlist
 Petra Kvitova in the prestigious eight-woman field on Wednesday.
 
 Williams is seeking a fifth win in five tries against Azarenka this year. The
 American great beat the Belarusian in last month's U.S. Open finale and is a
 lopsided 10-1 lifetime against Azarenka.
 
 The 23-year-old Azarenka needs only one more win this week to end the year
 at No. 1.
 
 The  Australian  Open champion  Azarenka  was  last year's  WTA  Championships
 runner-up  to  the Czech southpaw  Kvitova.
 
 The  2012 Wimbledon,  U.S. Open  and  Olympic champion  Williams captured  WTA
 Championships  titles  in 2001  and 2009  and is a  two-time runner-up at this
 prestigious event.
 
 This  week's four-player  Red Group  features  Azarenka  (1-0), Williams
 (2-0), Kerber and Li, while the White Group boasts 2004 champion and 2007 WTA
 Championships  runner-up  Maria Sharapova  (2-0),  Wimbledon runner-up
 Agnieszka Radwanska  (1-1),  the French  Open  runner-up Errani (0-1)  and
 the replacement Stosur.
 
 The  top-two players  in  each  group will  advance  to  the semifinals,  with
 the winners squaring off in the lucrative final on Sunday. Sharapova and
 Williams have already secured berths in the final four.
 
 The winner of this $4.9 million event could collect as much as $1.75 million.
 
 
 10/25 11:57:11 ET