Roger Federer's love affair with the ATP Finals continued Tuesday as he edged ahead in his growing rivalry with rising star Alexander Zverev. The six-time champion beat the German 7-6 (6), 5-7, 6-1 to make the semifinals for the 14th time in 15 appearances at the year-end finale. His victory brought the elimination of Marin Cilic.

Leo Spall, UK Correspondent