Federer reaches ATP Finals semis

Roger Federer guaranteed his place in Saturday’s ATP Finals semifinals by defeating Alexander Zverev 7-6 (6), 5-7, 6-1 in London.

Zverev will face Jack Sock on Thursday to decide who will join Federer in the final four. Sock beat Marin Cilic 5-7, 6-2, 7-6 (4) in the early match.