ATP Finals: Meet the last 5 players to have won the season-ending championship

#4 Grigor Dimitrov (2017)

Grigor Dimitrov celebrates his 2017 ATP Finals title

Riding on a career-best season which saw him win a maiden Masters 1000 title (Cincinnati), Grigor Dimitrov qualified for the prestigious season-ending 2017 ATP Finals in London for the very first time in his career.

Dimtrov beat fellow tournament debutant David Goffin, Roland Garros semifinalist Dominic Thiem and Rafael Nadal's alternate, Pablo Carreño Busta in the group-stage before beating another tournament debutant, Jack Sock, in the semifinals to book a rematch with Goffin for the title.

In a competitive final, Dimitrov won the first set but Goffin, who had beaten six-time champion Roger Federer in the semifinals, fought back to force a third set. The Bulgarian though soon re-asserted his ascendancy over Goffin to take home the biggest title of his career.

The win made Dimitrov the 22nd different player to triumph at the ATP Finals and the 11th unbeaten winner at the tournament. The Bulgarian rose to a career-high World No. 3 to close the season.

#3 Andy Murray (2016)

Andy Murray

2016 was a career-best season for Andy Murray. The Scot made title matches at the Australian Open and French Open (lost to Djokovic both times), won his second Masters 1000 title on clay at Rome and his 3rd Grand Slam singles title at Wimbledon. He followed that with a successful title defence at the 2016 Rio Olympics, before going on a tear after the US Open.

Murray raked up consecutive titles in Beijing, Shanghai, Vienna and Paris to become the first British player to climb atop the world rankings.

The year-end ATP ranking was on the line as Murray entered the season-ending 2016 ATP Finals (then called the ATP World Tour Finals). The Scot beat Kei Nishikori, Stan Wawrinka and Marin Cilic to top his group.

In a rematch of the year's Wimbledon title match, Murray conquered Milos Raonic in a third set-break in the semifinals to set up a title showdown with four-time defending champion Novak Djokovic - in a match which would determine the destination of the year-end No. 1 ranking.

Meeting the Serb for the fifth time in a tournament final (Djokovic led 3-1), Murray won 6-4 6-4 to become the newest year-end No.1 player in the singles rankings, and the oldest winner at the ATP Finals since Roger Federer in 2011.