Serena Williams overcame a sluggish start to beat Anastasia Potapova and reach the Australian Open fourth round.
Tenth seed Williams, bidding for a record-equaling 24th Grand Slam title, came through 7-6 (7-5) 6-2 against the 101st-ranked Russian.
However, the American had trailed 5-3 in an error-strewn first set, and she had to save two set points before dialing back in to win.
Naomi Osaka also advanced after a cagey match against Ons Jabeur of Tunisia.
Third seed Osaka and her opponent struggled for rhythm but it was the Japanese who prevailed 6-3 6-2.
Osaka will face two-time Grand Slam champion Garbine Muguruza next, while Williams plays seventh seed Aryna Sabalenka for a place in the quarter-finals.
She will face a tough test against big-hitting Belarusian Sabalenka, who beat American Ann Li 6-3 6-1
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