The Latest on Sunday from the Australian Open (all times local):

12:15 p.m.

Two-time Wimbledon champion Petra Kvitova is the first player into the Australian Open quarterfinals after beating 17-year-old American Amanda Anisimova 6-2, 6-1 to open play Sunday at Rod Laver Arena.

Kvitova, who had a WTA Tour-leading five tournament wins last year, extended her winning streak to nine matches after capturing the Sydney International title last week and her four wins at Melbourne Park this week. She hasn’t made the quarterfinals here since 2012.

Anisimova, one of three American women playing fourth-round matches Sunday, beat seeded players in the second and third rounds. She was the youngest player to reach the Round of 16 here since 2006 and the youngest in any Grand Slam tournament since 2007.

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11 a.m.

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's Amanda Anisimova makes a backhand return to Petra Kvitova of the Czech Republic during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. (AP Photo/Aaron Favila)
United States’s Amanda Anisimova makes a backhand return to Petra Kvitova of the Czech Republic during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Jan. (AP Photo/Aaron Favila)