WTA tourney down to semis

Angelique Kerber helped Dominika Cibulkova reach the semifinals of the WTA Finals on Thursday. Kerber, who had already advanced from the Red Group, beat Madison Keys 6-3, 6-3 to finish 3-0 in the round robin and eliminate her American opponent. Svetlana Kuznetsova, who is 2-0 in the White Group, has already qualified for the semifinals. The second semifinal spot from that group will be decided Friday when defending champion Agnieszka Radwanska plays Karolina Pliskova.