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Tennis - ATP Finals - The O2, London, Britain - November 16, 2019 Greece's Stefanos Tsitsipas in action during his semi final match against Switzerland's Roger Federer REUTERS/Peter Nicholls Stock Photo - Alamy
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10th November 2019 O2 Arena, London, England; Nitto ATP, Tennis Herren Tennis Finals; Dominic Thiem (AU
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ATP Finals: Rafael Nadal off to positive start but players feel absence of fans inside O2 Arena | The Independent
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ATP Finals 2019: Stefanos Tsitsipas begins campaign by claiming first-ever victory over Daniil Medvedev-Sports News , Firstpost
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Tennis - ATP Finals - The O2, London, Britain - November 14, 2019 Switzerland's Roger Federer in action during his group stage match against Serbia's Novak Djokovic REUTERS/Toby Melville Stock Photo - Alamy
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