SINGAPORE >> 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. Cibulkova beat Simona Halep 6-3, 7-6 (5) earlier in the day, giving her a 1-2 record.