Muguruza admits she was taken by surprise

Melbourne - Garbine Muguruza said she was taken by surprise by a brilliant Coco Vandeweghe after her upset defeat in the Australian Open quarter-finals on Tuesday.

The French Open champion was blasted off court by the unseeded American, including an embarrassingly one-sided second set in the 6-4, 6-0 loss.

"I was surprised. I think she played unbelievable. Three times we played in the past, she didn't show this level," Muguruza said.

"She played very good. Her serve, her shots were there. She barely missed."

But Muguruza added: "I have zero regrets about my performance.

"I think when you play with someone that has the power to disturb like this, to hit these kind of shots, and has a good day, I mean, it's difficult honestly."

Despite winning at Roland Garros last year Muguruza, 23, struggled with consistency in 2016.

But she had been in good touch at the season-opening Brisbane International and in Melbourne, until the big-hitting and confident Vandeweghe came along.

The American described her second set performance as "like a freight train, you couldn't stop it", with Muguruza having no answers.

The Spaniard said it had been a good start to the year, with plenty to look forward to.

"I'm very happy. I think it's a very good start of the year. I trained hard to kind of start well," she said.

"You never know if it's going to happen or not. So I'm pleased with the two tournaments I played.

"Even though I felt my body wasn't 100 percent and I didn't know how far I was going to go here, but I think I went pretty far."