Roger Federer stays alive at ATP Finals with Berrettini win

Tennis - ATP Finals - The O2, London, Britain - November 12, 2019, Switzerland's Roger Federer in action during his group stage match against Italy's Matteo Berrettini. [Reuters]

Roger Federer kept alive his hopes of a seventh ATP Finals crown on Tuesday, beating Italian debutant Matteo Berrettini 7-6 (7/2), 6-3 at London's O2 Arena.

The Swiss third seed put himself under enormous pressure by losing his first match on Sunday in straight sets in Group Bjorn Borg to Dominic Thiem.