Radwanska beats Kvitova to start WTA Championships
Agnieszka Radwanska beat erratic titleholder Petra Kvitova 6-3, 6-2 to start round-robin play at the WTA Championships.
Wimbledon champion Petra Kvitova claimed her sixth career title Sunday with a 6-4 6-1 win over Slovakian seventh seed Dominika Cibulkova in the WTA Tour's Linz Open.