Novak Djokovic defeats Kei Nishikori to reach the final at the World Tour Finals . Djokovic drops his first set of the week but prevails 6-1 3-6 6-0 in about 90 minutes . `` Generally it was my fault Federer wins a second straight match against Marin Cilic and moves into sole possession of the No. 1 ranking with victory over world number two Andy Murray. Federer saves four match points as he improves to 11-0 versus Wawrinka on hard courts .
Novak Djokovic defeats Kei Nishikori to reach the final at the World Tour Finals . Djokovic drops his first set of the week but prevails 6-1 3-6 6-0 in about 90 minutes . Federer wins a second straight match against Marin Cilic and moves into sole possession of the No. 1 ranking with victory over world number two Andy Murray. Federer saves four match points as he improves to 11-0 versus Wawrinka on hard courts .