Serena Williams survived an injury scare here Monday to make a winning start in her bid to cap a brilliant comeback season by regaining the WTA Championship title in the tour's season-end event.

The

Serena Williams captured her 15th Grand Slam title and fourth career US Open crown with a 6-2, 2-6, 7-5 victory Sunday over World No. 1 Victoria Azarenka.

In the first three-set final at the US Open

Saturday's US Open women's singles final between Serena Williams and Victoria Azarenka has been postponed until Sunday because of forecast heavy rains and storms in New York, organisers announced.

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Three-time champion Serena Williams, the fourth seed, cruised into her sixth US Open final on Friday with a 6-1, 6-2 win over Italian 10th seed Sara Errani.

Williams, the 14 Grand Slam title winner,

Three-time champion Serena Williams stormed into her 10th US Open quarter-final with a 6-0, 6-0 win over the Czech Republic's Andrea Hlavackova on Monday.

Williams, the fourth seed, will face Serb 12

Three-time champion Serena Williams reached the US Open last 16 on Saturday with a 6-4, 6-0 win over Russia's world 42 Ekaterina Makarova.

Williams, the fourth seed, will face either Maria Kirilenko

Top seed and five-time champion Roger Federer reached the US Open third round on Thursday with an easy 6-2, 6-3, 6-2 win over Germany's Bjorn Phau.

World number one Federer will tackle Spain's Fernan

Venus and Serena Williams became the first tennis players to win four Olympic golds on Sunday after a 6-4, 6-4 victory over Czech pair Andrea Hlavackova and Lucie Hradecka in the women's doubles final

Serena Williams clinched her first Olympic singles gold medal with a 6-0, 6-1 demolition of Maria Sharapova in the most one-sided women's final in the history of the Games on Saturday.

Williams' vict

Serena Williams has spent most of her career matching - and often breaking - older sister Venus' records. After tying Venus for the most WTA Tour titles among active players, there's little left for h