Roger Federer made it through to last four of the ATP Finals for 14th time in 15 appearances after seeing off young German Alexander Zverev 7-6 (8-6) 5-7 6-1 at London's O2 on Tuesday night.
Roger Federer made it through to last four of the ATP Finals for 14th time in 15 appearances after seeing off young German Alexander Zverev 7-6 (8-6) 5-7 6-1 at London's O2 on Tuesday night.
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