Things started off on the wrong foot for Dominika Cibulkova when she forgot her ballgirl at the WTA Finals in Singapore ... "I see the ball kid. From my box they told me you forgot the ball ...

On home soil and contesting her very first WTA main draw, 19-year-old Frenchwoman Tiantsoa Rakotomanga Rajaonah cruised into her first WTA quarterfinal with a 6-2, 6-3 victory over Jaqueline Cristian ...

Check out the full WTA rankings here. How do tennis rankings work? Women's tennis world rankings are calculated by the WTA, who award points based on a player's performance at particular tournaments.

(More Tennis News) Collins had lost each of her first six tour-level meetings with Sabalenka, including three US Open contests and three matches at WTA 1000 events, with the world number one ...