That says it all . '' Serena Williams sets up final clash with Serena Williams at WTA Championships . She has lost to Belorussian in last eight encounters but beat her in the Saturday final . Sharapova defeats world No . 1 Victoria Azarenka in Saturday 's second semifinal . Williams cruised into her fourth final , beating second -ranked Agnieszka Radwanska .
Serena Williams sets up final clash with Serena Williams at WTA Championships . She has lost to Belorussian in last eight encounters but beat her in the Saturday final . Sharapova defeats world No . 1 Victoria Azarenka in Saturday 's second semifinal . Williams cruised into her fourth final , beating second -ranked Agnieszka Radwanska .