![O2, London, UK. 16th November 2019. Visitors arrive in the O2 arena for semi-finals day at the 2019 Nitto ATP Finals as centre court prepares for the afternoon session of doubles and O2, London, UK. 16th November 2019. Visitors arrive in the O2 arena for semi-finals day at the 2019 Nitto ATP Finals as centre court prepares for the afternoon session of doubles and](https://c8.alamy.com/comp/2A9N425/london-uk-16th-nov-2019-stefanostsitsipas-of-greece-in-action-during-his-singles-match-against-roger-federer-of-switzerland-during-the-atp-world-tour-finals-at-the-o2-arena-on-november-16-2019-in-london-england-credit-paul-cunninghamalamy-live-news-2A9N425.jpg)
O2, London, UK. 16th November 2019. Visitors arrive in the O2 arena for semi-finals day at the 2019 Nitto ATP Finals as centre court prepares for the afternoon session of doubles and
![File:Defending Champion Alexander Zverev Beats Rafael Nadal at the Nitto ATP Tour Finals 2019 (49052218372).jpg - Wikimedia Commons File:Defending Champion Alexander Zverev Beats Rafael Nadal at the Nitto ATP Tour Finals 2019 (49052218372).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Defending_Champion_Alexander_Zverev_Beats_Rafael_Nadal_at_the_Nitto_ATP_Tour_Finals_2019_%2849052218372%29.jpg/1280px-Defending_Champion_Alexander_Zverev_Beats_Rafael_Nadal_at_the_Nitto_ATP_Tour_Finals_2019_%2849052218372%29.jpg)
File:Defending Champion Alexander Zverev Beats Rafael Nadal at the Nitto ATP Tour Finals 2019 (49052218372).jpg - Wikimedia Commons
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Arena. London, UK. 16th Nov, 2019. Nitto ATP Tennis Finals; A presentation on court to honour the players who have given many years of service on the ATP Tour: Nicolas Almagro, Marcos
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