Zverev sees off Cilic threat in error-strewn ATP Finals contest
Alexander Zverev saw off the challenge of Marin Cilic 7-6 (7/5), 7-6 (7/1) at the ATP Finals on Monday as Novak Djokovic prepared to launch his campaign for a record-equalling sixth title. In a match littered with dozens of unforced errors at London's O2