The former world No. 1 battled an inspired opponent and a shaky serve to ultimately advance in three grueling sets at the Melbourne Summer Set.

Meanwhile, No. 1-ranked Ashleigh Barty opens her campaign against a former No. 2.

Also, Polish No. 1s Hubert Hurkacz and Iga Swiatek hit new career-highs.

The former No. 1 hasn't been this far at a major tournament since 2019, but is yet to drop a set at the All England Club.

Garin, Khachanov, Samsonova, Fucsovics, Golubic: watch out for this quintet.

The No. 25 seed became the last U.S. woman standing in the bottom half after three of her countrywomen bowed out on Friday.

Having reached her first WTA final as a 17-year-old in Acapulco a year ago, the Canadian went one step further in Monterrey this year.

The eighth-ranked Russian put another jewel in his ATP 500-level crown, while the 18-year-old Dane won her first WTA tour title.

At the Lyon Open Saturday, Danish teenager Clara Tauson eased past seventh seed Paula Badosa, 7-5, 6-1, before Swiss Viktorija Golubic ousted second-seeded Fiona Ferro, 4-6, 6-0, 7-6 (4).

The winning team moves to the 2020 World Group draw. The losing team is relegated to World Group II next season.