Aryna Sabalenka clinched the year-end No. 1 spot in the women's rankings for the first time when Iga Swiatek lost at the WTA Finals on Tuesday.
Coco Gauff earned her second victory over Iga Swiatek in 13 career matchups , winning 6-3, 6-4 at the WTA Finals on Tuesday to reach the semifinals of the season-ending tournament.