MELBOURNE, Australia - Make it nine straight wins for Karolina Pliskova.

The No.7 seed and Brisbane International champion continued her undefeated start to 2019 with a 6-3, 6-1 win over No.18 seed Garbiñe Muguruza to reach the last eight of the Australian Open on Monday. 

From a break down at 2-1 in the opening set, the former World No.1 was on song for the duration of the 60-minute encounter, as she scored her eighth win in 10 career meetings against the two-time Grand Slam champion.

"I felt confident even coming to this match because I beat her so many times. I like these conditions here, I've been playing well the last couple of matches. I had tough match the day before, so I was feeling confident about this matchup somehow today," Pliskova said after the match.

"I was just putting pressure on her today. I think I was serving well, so there was not many things which I did wrong today. I was just too solid, and I had a game plan, and everything was working.

"The main thing I think was that I was feeling confident about her today, and coming to the match."

Overall, Pliskova crushed 23 winners and five aces to just three unforced errors in the match, never allowing Muguruza a foothold on Margaret Court Arena.

The Czech hit 14 winners to just one unforced error over the opening nine games, and even found yet another gear in the second set to pull away and across the finish line. 

After breaking in the first game of the match and holding with ease to stretch her run of games to five straight, the No.7 seed allowed Muguruza a hold of serve before she raced through the final four games with the loss of just two points. 

"Tt was a very tough match. I was expecting it. Pliskova, you have to put a lot of intensity with her. She makes you be on every single ball," Muguruza said in defeat.

"I think she was playing very well and finding her shots, especially with the serve in the good moments."

Looking to reach the semifinals of a Grand Slam for the first time since the 2017 French Open, Pliskova will next face either World No.1 Simona Halep or No.16 seed and 23-time major champion Serena Williams.

"[I] played [Serena at the] US Open. I didn't play well that match, so for sure, it would be good revenge to play her again - different conditions here. I think I'm playing a little bit better than I was last year, so I'm looking forward if she's going to win," Pliskova said.

"I think she's playing very solid this tournament. She didn't lose many games yet, but for sure it's going to be interesting, because Simona is a fighter, so she's not gonna give her anything today.

"I'll watch a little bit, and if I play Simona, of course I lost to her last year at quarterfinals, it would be the same - but hopefully better than last year."