Two-time Wimbledon champion Petra Kvitova opens play at Rod Laver Arena on Day 7 of the Australian Open with a match against 17-year-old American Amanda Anisimova.

Anisimova has beaten two seeded players on her way to the fourth round and a win Sunday would advance her to a quarterfinal against either Ashleigh Barty or Maria Sharapova, who meet in the following match at Rod Laver.

Rafael Nadal is to play his Round of 16 match against Tomas Berdych. Six-time champion Roger Federer, playing in his 20th Australian Open, takes on 20-year-old Stefanos Tsitsipas to open night play.

The weather is mostly sunny with an expected high temperature of 24 Celsius (75 Fahrenheit).

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United States' Amanda Anisimova celebrates after defeating Aryna Sabalenka of Belarus during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. (AP Photo/Mark Schiefelbein)
United States’ Amanda Anisimova celebrates after defeating Aryna Sabalenka of Belarus during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. (AP Photo/Mark Schiefelbein)