Novak Djokovic exited the ATP Finals after a straight-sets loss to Roger Federer, who said: "It was definitely magical."
Rafael Nadal clinched the year-end number one after Roger Federer eliminated Novak Djokovic from the ATP Finals.
Matteo Berrettini became the first Italian to win an ATP Finals match, beating Dominic Thiem in straight sets on Thursday.
Daniil Medvedev looked destined to leave Rafael Nadal on the brink of ATP Finals elimination, but the world number one surged back to win.
Tomas Berdych will make an announcement in London on Saturday, when it is widely expected he will confirm his retirement.
After edging Novak Djokovic in an ATP Finals thriller, Dominic Thiem revelled in his victory.
As he continues his recovery from injury, Andy Murray believes the grand slam events give his body the clearest path to success in future.
Daniil Medvedev's perfect record against Stefanos Tsitsipas is no more after the Russian was beaten by his rival in their ATP Finals bow.