Melbourne:American tennis player Coco Vandeweghe defeated defending champion and World No.1 Angelique Kerber in the fourth round of the Australian Open here on Sunday.

Vandeweghe edged past the local player 6-3, 6-2 to advance to the quarterfinals.

Vandeweghe will face in the quarterfinals seventh seed Garbine Muguruza who defeated Romania's Sorana Cirstea in staight sets 6-2, 6-3 in 65 minutes.

"I think it's my first win over a World No.1, I guess. I'll take it. I faked it a lot, because I was feeling a bit crap out there. You have to fake it until you make it. I just had to pick my spots and trust my game," Vandeweghe was quoted as saying by ESPN.in.

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