Madison Keys on her way to victory over Petra Kvitova at the Australian Open. Photo: Xinhua

Teenager Madison Keys shocks Wimbledon champion Petra Kvitova at Australian Open

Unseeded American, a big-serving baseliner, powers past No 4 seed to reach the last 16

Topic |   Australian Open 2015

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Madison Keys on her way to victory over Petra Kvitova at the Australian Open. Photo: Xinhua
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