Li Na overpowered back-injury victim Victoria Azarenka 6-2 6-1 to power through to the semi-finals at the WTA Championships.
Round-robin formats at tennis tournaments can cause confusion but Serena Williams has an easy solution, just keep winning.
Serena Williams showed her desire to defend her WTA Championships title by sweeping to a 6-3 6-1 win over Angelique Kerber.
Serena Williams aims to claim her 11th tournament trophy to round off one of the best years of her career.
Germany's Angelique Kerber claimed her first title of 2013 with a 6-4 7-6 (6) victory over Ana Ivanovic at the Linz Open.
Angelique Kerber thrashed Spain’s Carla Suarez Navarro to set up a final with Ana Ivanovic at the Linz Open in Austria.
Angelique Kerber has clinched the final spot at the WTA's season-ending championships after reaching the Linz Open semis.
World number 58 Stefanie Voegele shocked American Sloane Stephens in three sets at the Linz Open in Austria.
Sloane Stephens moved a step closer to the top 10 with an epic 7-6 4-6 6-3 win over Andrea Petkovic in Linz.
Ana Ivanovic moved into the quarter-finals in Linz with a 6-3 7-5 win over Francesca Schiavone.
WTA rankings on Monday (Last week's positions in brackets):
Serena Williams overcame the sixth seed Caroline Wozniacki 6-1 6-4 to progress to the semi-final of the China Open.
ATP World Tour Finals
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