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Ksenia Efremova: 12-year-old Russian tennis prodigy has 'incredible potential,' says Patrick Mouratoglou | CNN
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Ksenia Efremova: 12-year-old Russian tennis prodigy has 'incredible potential,' says Patrick Mouratoglou | CNN
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We followed the No. 1,700-ranked tennis player in the world to get an inside look at tennis' minor leagues - MarketWatch
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