Daria Gavrilova is through to the third round of the WTA tournament in Indian Wells after a straight-sets victory over Yanina Wickmayer.
The Australian toughed it out in a first set tiebreaker before easing to a 7-6 (7-3) 6-2 victory.
Gavrilova will meet seventh-seeded Frenchwoman Caroline Garcia or American Jennifer Brady in the round of 32.
The 26th-seeded Gavrilova is the lone Aussie remaining in the main draw after Ashleigh Barty and Samantha Stosur suffered second-round losses on Friday.
The comeback of Serena Williams continued with a battling 7-6 (7-5) 7-5 win over world No.29 Kiki Bertens.
The reward for the 23-time Grand Slam champion is a match-up with older sister Venus, after the eighth seed saw off Sorana Cirstea 6-3 6-4.
The younger of the Williams sisters is playing in her first competitive tournament since the birth of her daughter last September.
Williams served for the match at 5-4 and was down 15-40 while serving for the match again at 6-5, before she prevailed in one hour 53 minutes.
The fourth-seeded Elina Svitolina dropped the first set to Catherine Bellis before she charged home to win 2-6 6-1- 6-1.
Other second-round winners on Saturday were Elena Vesnina, Carla Suarez Navarro, Aliaksandra Sasnovich, Daria Kasatkina, Julia Goerges and Danielle Rose Collins.