Men's Tennis: 5 facts about the ATP World Tour Finals

# ITF was the organizer of the event in the early years

Grigor Dimitrov with the 2017 Nitto ATP World Tour Finals trophy

The tournament was christened as 'Masters Grand Prix' and was held under the aegis of the International Tennis Federation (ITF) from 1970 to 1989. During this period, no ranking points were awarded for participation in the tournament. ATP took over the running of the tournament in 1990 and renamed it as ATP Tour World Championship.

ITF created a rival event called the 'Grand Slam Cup' and it was only in 1999 that the two tournaments were merged and the tournament was re-branded as 'Tennis Masters Cup'. In its present avatar, the tournament is just known as 'ATP Finals'.

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# Most Singles appearances

Andre Agassi

The man widely considered to be 'GOAT', Roger Federer has made a record 16 appearances including making the final 10 times. Roger made his first appearance in 2002 and won his first ATP Finals title the following year beating Andre Agassi in the final.

2018 will mark the 17th appearance of Federer in this tournament. Federer has participated in the tournament unbroken from 2002 to 2017 barring 2016 when he ended his season after Wimbledon. Andre Agassi is second in the list with 13 appearances.