Stefanos Tsitsipas won the ATP Finals title after beating Dominic Thiem in the final.
Rafael Nadal defeated Stefanos Tsitsipas but Alexander Zverev pipped him to the semi-final of the ATP Finals.
ATP Finals 2019: Stefanos Tsitsipas thrashed defending champion Alexander Zverev 6-3, 6-2 to join Dominic Thiem in the semi-finals.
ATP Finals 2019: Rafael Nadal came from behind to defeat Daniil Medvedev 6-7 (3), 6-3, 7-6 (4).
Novak Djokovic has the chance to equal Roger Federer's record haul of six titles at the ATP Finals and also Rafael Nadal to the year-end number one spot.
Alexander Zverev thumped Rafael Nadal 6-2 6-4, with the world no.1 refusing to blame the recent injury for the loss.
ATP Finals 2019: Stefanos Tsitsipas defeated Daniil Medvedev 7-6(5), 6-4 in their tournament opener.
ATP Finals 2019: Alexander Zverev is the defending champion but Rafael Nadal and Novak Djokovic are battling for the year-end world No.1 rank.
ATP Finals 2019: Novak Djokovic and Rafael Nadal eye finishing the year ranked No.1 in the world at the event in London.
Rafael Nadal was drawn with Stefanos Tsitsipas, Alexander Zverev and Daniil Medvedev, as Novak Djokovic and Roger Federer were grouped together along with Dominic Thiem and Matteo Berrettini.
Rafael Nadal returned to the top of the latest ATP Rankings, even though Novak Djokovic won the Paris Masters.
ATP Paris Masters: Daniil Medvedev fell to a 6-4, 2-6, 4-6 loss against world No.65 Jeremy Chardy.
Roger Federer pulled out of the Paris Masters in order to "pace" himself for the next year.
Daniil Medvedev played his sixth consecutive final in Shanghai last week.
Daniil Medvedev has played six finals in a row as he closes in on the third place in the world ATP rankings.
Daniil Medvedev thumped Alexander Zverev in straight sets to win his second Masters 1000 title.
Shanghai Masters; Daniil Medvedev won his second Masters 1000 title with a 6-4, 6-1 victory over Alexander Zverev.
Daniil Medvedev served out the match on the second time of asking as he beat Stefanos Tsitsipas 7-6 (5), 7-5 to enter his ninth final of the year.
Alexander Zverev defeated Matteo Berrettini in a closely fought semi-final to book his place in the final of the Shanghai Masters.
All the 4 semi-finalists - Daniil Medvedev, Stefanos Tsitsipas, Alexander Zverev and Matteo Berrettini - at Shanghai Masters 1000 are 23 years old or younger.