Australian Open: Petra Kvitova crashes out to Madison Keys

Fourth seed Petra Kvitova was knocked out of the Australian Open by Madison Keys, while Venus Williams, Agnieszka Radwanska and Vika Azarenka all progressed.

Petra Kvitova struggles against Madison Keys
Petra Kvitova struggles against Madison Keys

Kvitova lost in straight sets, 6-4 7-5, to the young American, now being coached by Lindsey Davenport.

Eighth seed Venus Williams needed a set to get going before she beat Italy's Camila Giorgi 4-6 7-6(3) 6-1.

"That feels fantastic especially when things happen in your life that are not in your control," said the 34-year old, who struggles with Sjogren's syndrome, an auto-immune disease that can cause joint pain and fatigue. "But I don't want to stop now, I want to keep it going. This little cat has a few tricks up her sleeve."

And sixth seed Agnieszka Radwanska also continued her largely untroubled, yet under the radar, progress through the draw with a 6-0 7-5 win over Varvara Lepchenko and will meet Venus on Monday.

"I think playing her is always great challenge," Radwanska said. "I think she is still playing great tennis even she's a bit older. She's still really fit and playing a high level. I think it's going to be another good match."

Victoria Azarenka beat Barbora Zahlavova Strycova in straight sets, 6-4 6-4, and proceeded to swear in her courtside interview to describe her dismay at missing an attempted lob when serving for the match.

The 25-year-old told her interviewer the word could be "bleeped out" and later made no apologies.

"I'm having a lot more fun," Azarenka said. "I'm just being me. I say what I want to say. I laugh when I want to laugh. I play how I want to play. I grunt when I want to grunt."

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