Semifinal Saturday at the TEB BNP Paribas WTA Championships started with the first doubles semifinal.
Defending champions Liezel Huber and Lisa Raymond faced off with No.2 seeds Andrea Hlavackova and Lucie Hradecka.
The Czech duo fought off four set points in the first set and eventually beat the American pairing, 76(6) 61.
The first singles semifinal saw Agnieszka Radwanska take on Serena Williams a day after a marathon round robin win.
With the crowd cheering loudly for both players - this group for Serena Williams - the atmosphere was electric.
Saturday set a new attendance record for the tournament of 15,498, besting last year's crowd for the final, 13,676.
But while Serena Williams looked as fresh as a daisy, the same thing couldn't be said for Agnieszka Radwanska...
Agnieszka Radwanska had battled for three hours and 29 minutes the day before to secure her spot in the semifinals.
In the end Serena Williams ended up with a 62 61 win over the No.4, her 17th straight win over a Top 5 player.
The second singles semifinal was a fight between World No.1 Victoria Azarenka and World No.2 Maria Sharapova.
Victoria Azarenka had won their last six hardcourt meetings but Maria Sharapova turned the tides with a 64 62 win.
But Victoria Azarenka left with a smile, having become the first in WTA history to earn $7 million in a season.
The second doubles semifinal saw Maria Kirilenko and Nadia Petrova oust No.1 seeds Sara Errani and Roberta Vinci.
Sara Errani and Roberta Vinci still walked away as the year-end No.1 team for 2012, with the trophies to prove it.
And year-end No.1 for singles went to Victoria Azarenka, who will continue to be a threat for many years to come.