2015 ATP World Tour Finals Author:SI StaffPublish date:Nov 23, 20152015 ATP World Tour Finals Novak DjokovicJulian Finney/Getty Images Novak DjokovicClive Brunskill/Getty ImagesATP Finals Roger FedererClive Brunskill/Getty Images Roger FedererClive Brunskill/Getty Images David FerrerGLYN KIRK/AFP/Getty Images Stan WawrinkaGLYN KIRK/AFP/Getty Images Stan WawrinkaClive Brunskill/Getty Images Tomas BerdychJulian Finney/Getty Images Kei NishikoriClive Brunskill/Getty Images Tomas BerdychGLYN KIRK/AFP/Getty Images Andy MurrayClive Brunskill/Getty Images Andy MurrayPeter Staples/ATP World Tour Rafael NadalJulian Finney/Getty Images Rafael NadalJulian Finney/Getty Images Rafael Nadal, Novak DjokovicClive Brunskill/Getty ImagesATP Finals Roger FedererGLYN KIRK/AFP/Getty Images Roger Federer, Stan WawrinkaLEON NEAL/AFP/Getty Images David Beckham, Stan SmithJulian Finney/Getty Images Stan WawrinkaGLYN KIRK/AFP/Getty Images Horia Tecau and Jean-Julien RojerClive Brunskill/Getty Images Horia Tecau and Jean-Julien RojerGLYN KIRK/AFP/Getty Images Novak DjokovicClive Brunskill/Getty Images Novak DjokovicGLYN KIRK/AFP/Getty Images Novak Djokovic, Roger FedererGLYN KIRK/AFP/Getty Images Roger FedererClive Brunskill/Getty Images Roger FedererGLYN KIRK/AFP/Getty Images Novak DjokovicGLYN KIRK/AFP/Getty Images Roger Federer, Novak DjokovicYunus Kaymaz/Anadolu Agency/Getty Images Novak DjokovicYunus Kaymaz/Anadolu Agency/Getty Images Novak DjokovicPeter Staples/ATP World Tour Bob and Mike BryanClive Brunskill/Getty Images Novak DjokovicClive Brunskill/Getty Images Andy MurrayGLYN KIRK/AFP/Getty Images Andy MurrayClive Brunskill/Getty Images Rafael NadalJUSTIN TALLIS/AFP/Getty Images Andy MurrayClive Brunskill/Getty Images Stan WawrinkaJulian Finney/Getty Images Stan WawrinkaJulian Finney/Getty Images Fabio Fognini and Simona BolelliJUSTIN TALLIS/AFP/Getty Images Kei NishikoriJulian Finney/Getty Images Roger FedererJulian Finney/Getty Images Kei NishikoriYunus Kaymaz/Anadolu Agency/Getty Images Roger FedererYunus Kaymaz/Anadolu Agency/Getty Images Novak Djokovic, Tomas BerdychJUSTIN TALLIS/AFP/Getty Images Boris BeckerYunus Kaymaz/Anadolu Agency/Getty Images Tomas BerdychYunus Kaymaz/Anadolu Agency/Getty ImagesGLYN KIRK/AFP/Getty Images David FerrerJulian Finney/Getty Images Rafael NadalJulian Finney/Getty Images Rafael NadalGLYN KIRK/AFP/Getty ImagesLatest NewsNovak Djokovic Suffers Unexpected Defeat in Indian Wells vs. 20-Year-Old Luca NardiTennis Q&A: Anti-Doping Lawyer Howard Jacobs on Simona Halep’s CaseRafael Nadal Withdraws From Indian Wells Before Playing in First RoundMailbag: The Aftermath of Andrey Rublev’s On-Court Outburst and DefaultSimona Halep’s Ban Reduced: What It Means for Tennis’s Anti-Doping Policy