Rafa Nadal optimistic of an improved year after difficult 2015 | Tennis News | Sky Sports
File:Cincinnati-Tennis-2015-ATP-WTA-55 (20665922798).jpg - Wikimedia Commons
Djokovic to Face Federer in Season Finale - The New York Times
ATP World Tour Finals 2015 Results: Tuesday Tennis Scores and Updated Schedule | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
Roger Federer shocks off-key Novak Djokovic at ATP World Tour Finals | ATP World Tour Finals | The Guardian
2015 Barclays ATP World Tour Finals on Tuesday - feat. Djokovic v Federer - YouTube
Roger Federer v Stanislas Wawrinka: ATP World Tour Finals – as it happened | ATP World Tour Finals | The Guardian
File:Cincinnati-Tennis-2015-ATP-WTA-150 (20853463875).jpg - Wikipedia
ATP World Tour Finals 2015 prize money: £1.5m earnings boost on offer for Novak Djokovic, Andy Murray, Roger Federer and others at O2 Arena - CityAM
Novak Djokovic guarantees spot in 2015 ATP World Tour Finals | India.com
No Athlete Had a Better 2015 Than Novak Djokovic | The New Yorker
Rafael Nadal US Open 2015 | Rafael nadal, Tennis workout, Atp tennis
2015 ATP Tour Looking Ahead: More Rafael Nadal, Federer & Djokovic - Movie TV Tech Geeks News
ATP Malaysian Open 2015 – Stock Editorial Photo © chenws #84902108
ATP World Tour Finals 2015 - Djokovic poised for Federer duel - The Championships, Wimbledon - Official Site by IBM
ATP World Tour Finals 2015 - Federer halts Djokovic hot streak - The Championships, Wimbledon - Official Site by IBM
London, UK. 19th November, 2015. ATP Tour Tennis Finals Day 5. Novak Djokovic (SRB) defeats Tomas Berdych (CZE) by a score of 6-3, 7-5 during Day Five Barclays ATP World Tour Finals
/origin-imgresizer.eurosport.com/2015/11/22/1737588-36749986-2560-1440.jpg "Novak Djokovic hails 'best year of career' after emphatic final win over Roger Federer - Eurosport")
Novak Djokovic hails 'best year of career' after emphatic final win over Roger Federer - Eurosport
Viktor Troicki of Serbia celebrates after he won the semifinal of the Mercedes Cup ATP tennis tournament against Marin Cilic of Croatia in Stuttgart, Germany, Saturday June 13, 2015. Cilic will play
ATP Finals: What time does Rafael Nadal play against Novak Djokovic in London? – Rafael Nadal Fans
2015 Western & Southern Open Cincinnati - ATP Quarter-Final Highlights - YouTube
ATP World Tour Finals: Federer stuns Djokovic | CNN
/origin-imgresizer.eurosport.com/2015/11/19/1735439-36707006-2560-1440.jpg "Roger Federer edges out Kei Nishikori at ATP World Tour Finals - Eurosport")
Roger Federer edges out Kei Nishikori at ATP World Tour Finals - Eurosport
Breaking Down the Late Stages of the 2015 ATP World Tour Finals | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
