Wta Championships

Serena thumps Radwanska, Jankovic beats Azarenka to advance in Istanbul

Earlier in White Group Serbia's Jelena Jankovic beat second seed Victoria Azarenka 6-4 6-3, aided by 40 unforced errors from her erratic opponent.

Serena Williams eases past Kerber in WTA Championships

Kerber, who qualified for the eight-strong tournament only because Maria Sharapova pulled out, won just five games when she was beaten by Williams in her opening match last year.

For my sanity I wanted to end on a high: Serena on Istanbul win

Serena Williams' motivating factor in her WTA Championships triumph on Sunday was to save her own sanity, the American said after beating Maria Sharapova 6-4, 6-3 in the final of the season-ending tournament.

WTA Championships: Serena stuns Azarenka again

The Wimbledon and US Open champion recorded a 6-4, 6-4 win at the season-ending event, her fifth triumph over the Belarusian this year. Williams also owns an 11-1 record in their career head-to-heads.

Defending champ Kvitova pulls out of WTA Championships

Kvitova withdrew from the WTA Championships due to a viral illness and will be replaced by Samantha Stosur. Kvitova was able to play her first match in the White group on Tuesday but now Stosur will complete the other matches the Czech was due to play.

Weary Wozniacki sent packing by Kvitova

The day after the Dane secured the year-end world number one ranking, she looked mentally and physically drained as Wimbledon champion Kvitova marched into the semi-finals with a match to spare in the Red Group.