MELBOURNE - Serena Williams will lead the charge of American women in the last-eight of the Australian Open and continue her bid for a record-equalling 24th Grand Slam title when she meets a familiar foe in second seed Simona Halep on Tuesday.

“They’re very close off the court. They hit a lot. They like to practise with each other a lot,” said Pegula’s coach, David Witt. “I think it’s one of those things where they’re pushing each other. They root for each other.

“They see one do well; they all three want each other to do well. I think it’s almost like, for them, a little sister thing where they’re kind of pushing each other to do well in tournaments.”

Williams leads 9-2 in the head-to-head but lost the most recent meeting when she was beaten by Halep in the 2019 Wimbledon final - one of her four defeats in Grand Slam finals since returning to the circuit in 2018 after becoming a mother

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The trio would have had no better idol at the start of their careers than Williams, who will meet Romanian twice Grand Slam winner Halep in the evening session at the Rod Laver Arena in their 12th meeting on tour.

Williams leads 9-2 in the head-to-head but lost the most recent meeting when she was beaten by Halep in the 2019 Wimbledon final - one of her four defeats in Grand Slam finals since returning to the circuit in 2018 after becoming a mother.

Japan’s Naomi Osaka, who moved to the United States as a three-year-old and lives and trains there, was another player who defeated Williams in the 2018 US Open to win the first of her three majors and could be next up for the American.

Osaka, currently ranked third, will kick off Tuesday’s proceedings at Melbourne Park against unorthodox 35-year-old Hsieh Su-wei of Taiwan, a first time major quarter-finalist.

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Also in action will be eight-time Australian Open champion and top-ranked Novak Djokovic, who will have concerns over an abdominal injury when he plays sixth-seeded German Alexander Zverev, the finalist at the 2020 US Open.

In the day’s other singles match, Russian qualifier Aslan Karatsev, ranked 114th, will look to continue his spectacular run on his Grand Slam debut when he takes on 18th-seeded Grigor Dimitrov of Bulgaria.