Sabalenka defeated qualifier Moyuka Uchijima 6-2, 6-2 in just 62 minutes, while Rybakina rallied from 4-2 down in the second set to oust Arantxa Rus 6-3, 6-4.
The World No.2 defeated Poland's Magda Linette 6-4, 3-6, 6-3 in a match that lasted for two hours and 9 minutes to book her place in the third round of the tournament.