Serena loses it! Furious Williams smashes her racket as U.S. teenager dumps her out of Australian Open

Serena Williams had no idea how bad things were going to get when she muttered to herself that this year's Australian Open had been the 'worst two weeks'.

Not long after a courtside microphone picked up the comment during her quarterfinal with American Sloane Stephens, 19, not only did she lose to the teen, but she received a code violation after smashing her racket in fury.

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