
Angelique Kerber of Germany competes during the WTA Finals round robin match against Petra Kvitova of Czech Republic held at Singapore Indoor Stadium in Singapore, Oct. 26, 2015. Angelique Kerber won 2-0. (Xinhua/Then Chih Wey)

Angelique Kerber of Germany competes during the WTA Finals round robin match against Petra Kvitova of Czech Republic held at Singapore Indoor Stadium in Singapore, Oct. 26, 2015. Angelique Kerber won 2-0. (Xinhua/Then Chih Wey)