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The Baltimore Sun

Serena Williams

In the semi-final round of the 2009 U.S. Open, Serena Williams was called for a foot fault in her match against Kim Clijsters, earning her a point violation. She began screaming obscenities at the lineswoman who made the call. Due to Williams' foot fault violation and an earlier racquet abuse warning, Clijsters was awarded the match.JARED WICKERHAM, GETTY IMAGES