The 26-year-old comfortably overcame Kiki Bertens to reach her first grandslam semifinal in almost two years.
Muguruza said the two players are no stranger to each other as they've met before. However, she credited her victory to being able to find a way to disturb Berten's game.
"I feel like she's a very solid player, has a big serve. She's physically very strong. I was expecting that it's going to be a tough match because every time we played, it has been like this and I was ready for it," Muguruza.
"I played my game, aggressive game. Right away, I felt it was working. I remember that she beat me, that's for sure. I think I'm a different player now. Completely different. We both like the baseline. I found a way to disturb her game."
Muguruza is very delighted to be in the quarterfinals. She said the Australian Open is one of the tournaments that motivates her the most. Also, she would like to win the tournament one day.
"It feels very good. It's hard to get here. I feel like I've been here I think three years ago. It is very good to be back here. Is one of the Grand Slams that one day I would like to win. It's exciting.
"I feel good in this tournament. I'm super concentrated on every single match, especially because I started the tournament so-so. I feel like my body's getting healthier.
"It's a Grand Slam, we are all very concentrated here. For me, it's one of the tournaments that motivates me the most."
The Spaniard will play
current world no 30 Anastasia Pavlyuchenkova in the quarterfinal on Wednesday.
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