The World No. 1 was defeated by the defending champion, while Stefanos Tsitsipas defeated Daniil Medvedev for the first time on the #ATPTour. A day of surprises at the Nitto ATP Finals! Relive the action with our daily wrap. SUBSCRIBE: http://bit.ly/2dj6EhW WEBSITE: http://www.atptour.com/ FACEBOOK: https://www.facebook.com/ATPTour/ TWITTER: https://twitter.com/ATP_Tour INSTAGRAM: https://www.instagram.com/atptour/ RADIO: http://bit.ly/2Dictrm PODCAST: http://bit.ly/2NilRRn About the Official ATP Tour YouTube Channel: Here you will find the latest videos from the ATP Tour, including hot shots, highlights, behind the scenes footage, documentaries and more. The ATP Tour showcases the best of the best, competing in 63 tournaments across 4 surfaces, all to be No. 1. Find all the action from on and off the court right here.