Melbourne, Australia -- All of 17, never the winner of a Grand Slam match until this week, Amanda Anisimova is making quite a first impression at the Australian Open. Anisimova showed precisely why there are those who consider her a possible future star, producing one spectacular shot after another Friday to upset 11th-seeded Aryna Sabalenka of Belarus 6-3, 6-2 and reach the fourth round.

"I want to win this tournament," Anisimova said, tapping her right index finger on a table for emphasis at her post-match news conference. "Right now."

She is the youngest American to get this far at Melbourne Park since Jennifer Capriati in 1993 - and at any Grand Slam tournament since Serena Williams at the 1998 French Open. Pretty heady company.

Amanda Anisimova of the U.S. in action during the match against Belarus' Aryna Sabalenka in the third round of the Australian Open in Melbourne Park, Melbourne, Australia, January 18, 2019. ADNAN ABIDI / REUTERS

"This is an unreal feeling," Anisimova said. "I can't believe that this is happening right now."

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Believe it, kid. She captured a ton of attention on Day 5, when defending champion Caroline Wozniacki was knocked out by 2008 champion Maria Sharapova 6-4, 4-6, 6-3. Another American woman, 35th-ranked Danielle Collins, joined Anisimova in earning a debut trip to the round of 16 at a major with a 6-3, 6-2 victory over No. 19 Caroline Garcia. Up next for Collins will be three-time major champion and former No. 1 Angelique Kerber, who needed less than an hour to overwhelm 240th-ranked Australian wild-card entry Kimberly Birrell 6-1, 6-0.

Amanda Anisimova of the U.S. celebrates her victory against Belarus' Aryna Sabalenka during their women's singles match on day five of the Australian Open tennis tournament in Melbourne on January 18, 2019. Greg Wood / AFP/Getty Images

At the 2006 U.S. Open, when she was 19, Sharapova became the most recent teen to claim a Slam title. Anisimova grew up cheering for Sharapova - they now share an agent - and would love to match her feat of winning a major before age 20. Who would doubt her?

"I respect her a lot, because I think she's young and has a great game. I mean, she's really proving what she can do," said Sharapova, who sat at the same table as Anisimova at their agent's wedding last year. "She has a really bright future ahead of her."

It's not just that Anisimova, who was born in New Jersey and is based in Florida, has knocked off two seeded players already, including the hard-hitting Sabalenka, who was many a pundit's pick for a deep run at Melbourne Park.

Or that she's dropped a measly total of 17 games through three matches.

It's the way the 87th-ranked Anisimova - there is no one younger in the WTA's top 100 - is doing it, with clean and dangerous shotmaking and impeccable court coverage.

Take the shot - shot of the match? Of the tournament? Of the year so far? - that she produced at 3-0, 15-all in the second set.

It was a 12-stroke exchange in which Sabalenka held the upper hand throughout, steering Anisimova from corner to corner. It culminated with one sprint by Anisimova to her right for a forehand, then a sprint to her left for a backhand, followed by yet another switch of direction for a sprint back to her right. Her momentum carried her well wide of the doubles alley as she conjured up a "How did she do that?!" squash-like forehand that looped past Sabalenka and somehow landed in a corner for a winner, drawing raucous appreciation from the crowd at Margaret Court Arena - and an ever-so-slight smile from Anisimova.

"I'm really feeling good out here," said Anisimova, who is coached by her father, as well as the same person who's worked with her since she was 9. "I'm playing some really good tennis."

That's an understatement.

She delivered more winners than Sabalenka, 21-12, as well as fewer unforced errors, 13-9. Anisimova won all eight of her service games, saving the lone break point she faced. She broke the hard-serving Sabalenka four times.

Anisimova's first trip to Australia, and third appearance in the main draw at a major, now progresses to Week 2 and a matchup against two-time Wimbledon champion Petra Kvitova, who beat Belinda Bencic 6-1, 6-4.