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Security stepped up at ATP World Tour Finals after Paris terror attacks | ATP World Tour Finals | The Guardian
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London, UK. 12th Nov, 2019. 12th November 2019; O2 Arena, London, England; Nitto ATP Tennis Finals; A general view of O2 Arena during the match between Roger Federer (SUI) and Matteo Berrettini (
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ATP Finals: How the O2 Arena gets transformed from an entertainment venue to a tennis tournament - Sport360 News
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