Barty overwhelmed British wild card Harriet Dart 6-1, 6-1 while seven-time champion Williams, 37, produced her most convincing display in dispensing with German Julia Goerges 6-3, 6-4
Serena Williams and Ashleigh Barty
London: World No. 1 Ashleigh Barty booked her maiden place in the fourth round at Wimbledon on Saturday while Serena Williams made the second week for the 16th time.
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Barty overwhelmed British wild card Harriet Dart 6-1, 6-1 while seven-time champion Williams, 37, produced her most convincing display in dispensing with German Julia Goerges 6-3, 6-4.
Barty, bidding to become the first Australian Wimbledon women's champion since Evonne Goolagong Cawley won her second title in 1980, will play unseeded American Alison Riske for a place in the last eight.
She is also the first Australian woman to make the second week since 2010. "That was really good," said Barty.
Two-time champion Petra Kvitova reached the Last 16 for the first time in five years — the last time she did in 2014 she won her second title.
Czech sixth seed Kvitova defeated Poland's Magda Linette 6-3, 6-2 and will face either Britain's Johanna Konta or Sloane Stephens of the United States for a place in the quarter-finals.
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