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.
Victoria Azarenka has become the latest top player to argue that men's Grand Slam matches should be reduced.
Serena Williams cruised to a straight sets 6-2 6-4 win against Agnieszka Radwanska at the WTA Championships.
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.
Angelique Kerber has clinched the final spot at the WTA's season-ending championships after reaching the Linz Open semis.
WTA rankings on Monday (Last week's positions in brackets):
Maria Sharapova has withdrawn from the season-ending WTA Championships in Istanbul due to a shoulder injury.
Round-up: Li Na overcame Germany's Sabine Lisicki 7-5 6-4 to reach the quarter-finals of the China Open on Wednesday.
The Australian Open will hike total prize money 10 per cent in 2014 to A$33 million, offsetting a depreciation in the local currency.
Victoria Azarenka's China Open title defence wilted in the first round when she lost to Andrea Petkovic 6-4 2-6 6-4.
ATP World Tour Finals
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