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Serena Williams edges out Tsvetana Pironkova to reach US Open semi-finals against Victoria Azarenka | Tennis News | Sky Sports
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Tsvetana Pironkova wins thriller against Alize Cornet to continue remarkable US Open run - Eurosport
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Serena Williams digs deep against Pironkova to reach US Open semi-finals | US Open Tennis 2020 | The Guardian
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