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Tennis - Barclays ATP World Tour Final's - 02 Arena - London - 21/11/10 David Ferrer - Spain Mandatory Credit: Action Images / Henry Browne Stock Photo - Alamy
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ATP bosses working on revised 2020 calendar, but O2 Arena set to host ATP Finals with or without fans - Tennis365
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Tennis - ATP World Tour Final's - 02 Arena, London - 28/11/09 Switzerland's Roger Federer celebrates Mandatory Credit: Action Images / Scott Heavey Livepic Stock Photo - Alamy
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