Mira Andreeva defeated Aryna Sablanka in the match of the last WTA tournament.
The group stage of the competition takes place in Indian Wells, California.
The meeting between Russian and Belarusian tennis players ended with the result 6:4, 6:0.
Earlier, in the first match of the Women's Tennis Association tournament, Andryva defeated Ukraine's Alina Svitolina, and Sablanka defeated the Czech athlete Karolina Muchova.
Mira Andreeva is 19 years old and ranked third in the WTA rankings. The 28-year-old Sabalenka is considered the second best racket in the world.