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After disputing a foot fault, the line judge claims Serena said she would "kill her", resulting in a penalization of one point for verbal abuse. Williams had already been given a code violation for smashing her racket. The game ended with Serena shaking hands with her Clijsters, who proceeds to the finals.
The video is going viral on YouTube, with one version receiving 67,000+ views since last night. It's also among the most discussed topics on Twitter.