Fifth-seeded Serena Williams beat New Zealand's Marina Erakovic 6-2, 6-2 yesterday as she and sister Venus edged closer to a clash on the green clay courts of Charleston
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Serena, Venus on collision course
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She could eventually face a semi-final showdown with elder sister Venus, who rallied from 2-4 down in her opening set to beat Anastasia Rodionova 7-5, 6-2. u00a0
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