Anett Kontaveit stretched her winning streak to 12 matches by beating Karolina Pliskova 6-4, 6-0 to secure a spot in the semifinals at the WTA Finals.

American Danielle Collins captured her second career title in just a two-week span, holding off No. 4 seed Daria Kasatkina of Russia 6-3, 6-7 (10), 6-1 after a thrilling second-set tiebreaker to win the Mubadala Silicon Valley Classic.