Highlights: Federer Progresses Unbeaten As Sock Downs Zverev Nitto ATP Finals Round Robin

Watch highlights as Roger Federer downs Marin Cilic to remain unbeaten, while Jack Sock secures a semi-final berth with an upset of Alexander Zverev in round-robin play at the Nitto ATP Finals. Watch the Nitto ATP Finals live at http://tnn.is/streamlive. Photo: Peter Staples/ATP World Tour

Subscribe to our YouTube Channel: http://bit.ly/2dj6EhW

Visit the official site of men’s professional tennis: http://www.atpworldtour.com/

FOLLOW THE ATP WORLD TOUR
Watch live and on demand: http://www.tennistv.com/
Check live scores: http://www.atpworldtour.com/en/scores
View the latest rankings: http://www.atpworldtour.com/en/rankings
Meet the players: http://www.atpworldtour.com/en/players
Follow the tournaments: http://www.atpworldtour.com/en/tournaments
Catch up on tennis news: http://www.atpworldtour.com/en/news

JOIN THE CONVERSATION!
Download MyATP: http://www.myatp.com/
Like us on Facebook: https://www.facebook.com/ATPWorldTour/
Follow us on Twitter: https://twitter.com/ATPWorldTour
Follow us on Instagram: https://www.instagram.com/atpworldtour/
Follow us on Google+: https://plus.google.com/+ATPWorldTour