With a 6-1, 6-2 victory over 14th-seeded Mirra Andreeva to open play Sunday at Rod Laver Arena, Aryna Sabalenka advanced to the quarterfinals of the Australian Open. She'll be joined there by Coco Gauff.

Defending champion Aryna Sabalenka knocks out teenager Mirra Andreeva on Rod Laver Arena; Coco Gauff battles back to set up showdown with Spaniard Paula Badosa; watch all the action from the ATP and WTA Tours on Sky Sports Tennis and Sky Sports+,

MELBOURNE, Australia — It was a meaningless hit-and-giggle session, a mixed doubles exhibition at Rod Laver Arena just for fun and charity in front of fans a few days ahead of the Australian Open , so Coco Gauff was calling out how fast she would try to hit some serves.