Champion Tsitsipas in Nadal's group at ATP Finals

IMAGE: Greek Stefanos Tsitsipas beat Austria's Dominic Thiem to win the 2019 ATP Finals. Photograph: Arnd Wiegmann/Reuters Defending champion Stefanos Tsitsipas was placed in the same round-robin......

Tour Finals PHOTOS: Wawrinka knocks out Murray; Nadal survives Ferrer

IMAGE: Switzerland's Stanislas Wawrinka celebrates during his match against Great Britain's Andy Murray in their round-robin match at the 02 Arena in London on Friday. Photograph: Suzanne Plunkett......

Tour Finals PIX: Djokovic is year-end World No 1; Bopanna-Mergea down Bryan twins

Federer strolls past Berdych IMAGE: Serbia's Novak Djokovic holds aloft the trophy for finishing Number One ATP Men's Tennis Player in the World for 2015 following his win against Kei Nishikori at......

ATP World Tour PHOTOS: Federer repels Nishikori fightback; Bryans edge cliffhanger

IMAGE: Switzerland's Roger Federer celebrates after winning his match against Japan's Kei Nishikori. Photograph: Suzanne Plunkett/Reuters Roger Federer's enduring brilliance and his sheer......

ATP World Tour Finals PHOTOS: Federer ends Djokovic's 23-match winning streak

Nishikori stays in hunt after win over Berdych IMAGE: Switzerland's Roger Federer plays a backhand in his men's singles match against Serbia's Novak Djokovic on Day 3 of the Barclays ATP World......