Nadia Petrova has withdrawn from the Australian Open after the death of her mother in a car crash.
Sara Errani romped to a 6-1 6-1 win over Alisa Kleybanova in Cagliari to hand Italy their third Fed Cup title in five years.
Roberta Vinci won a three hour, 13 minute marathon against Russia's Alexandra Panova as Italy grabbed a 2-0 lead in the Fed Cup final on Saturday.
Ana Ivanovic, Sam Stosur, Anastasia Pavlyuchenkova and Simona Halep qualified for the semi-finals of the Tournament of Champions in Sofia.
Irina Khromacheva took to Twitter to express her delight at being in Russia's team to face Italy in the Fed Cup final.
Ana Ivanovic battled past Sam Stosur to maintain her 100% record at the Tournament of Champions in Sofia.
Sam Stosur got her Tournament of Champions off to a winning start against Elena Vesnina in Sofia.
Twice winner Ana Ivanovic started her Tournament of Champions campaign with an easy win over Tsvetana Pironkova in Sofia.
WTA rankings on Monday (Last week's positions in brackets):
Serena Williams beat Russian Maria Kirilenko 7-5 7-5 to advance to the quarter-finals of the China Open.
Round-up: Li Na overcame Germany's Sabine Lisicki 7-5 6-4 to reach the quarter-finals of the China Open on Wednesday.
WTA rankings on Monday (Last week's positions in brackets): points
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