The 2020 ATP Finals get underway in London on Sunday as the top eight male tennis players in the world compete for the prestigious title.
Qualification is based on points accumulated throughout the season. Those who qualify are then split into two groups of four in a round-robin format, meaning each player plays three group-stage matches.
The top two from each group progress to the semi-finals.
Ranking points and prize money is broken down based on wins throughout the tournament. The maximum on offer is 1,500 points and $1.564 million if a player wins the title undefeated.
This will be the last year London will host the ATP Finals having staged the tournament since 2009.
The most notable absentee from this year's edition is Roger Federer, who would have qualified in fifth position but underwent knee surgery. Diego Schwartzman, in ninth place, was therefore promoted to eighth.
The photo gallery above contains profiles on the eight players competing this week. To move on to the next profile, click on the arrows or if using a mobile device, simply swipe.
Group Tokyo 1970
Novak Djokovic, Daniil Medvedev, Alexander Zverev, Diego Schwartzman
Group London 2020
Rafael Nadal, Dominic Thiem, Stefanos Tsitsipas, Andrey Rublev
First round of fixtures (UAE time)
Sunday, 6pm: Dominic Thiem v Stefanos Tsitsipas
Monday, midnight: Rafael Nadal v Andrey Rublev
Monday, 6pm: Novak Djokovic v Diego Schwartzman
Tuesday, midnight: Daniil Medvedev v Alexander Zverev
2019: Stefanos Tsitsipas
2018: Alexander Zverev
2017: Grigor Dimitrov
2016: Andy Murray
2012-2015: Novak Djokovic
2010-2011: Roger Federer
2009: Nikolay Davydenko