#4 Pete Sampras
For many years, Pete Sampras held the record for the most Grand Slam Singles titles with 14. The American nicknamed 'Pistol Pete' for his quick serves was an expert in the old-fashioned serve-and-volley style of play making him one of the finest grass court players of all-time.
He holds the record for finishing as the Year-end World 1 on 6 consecutive occasions from 1993 to 1998. Sampras won the ATP Finals 5 times in 1991, 1994, 1996, 1997 and 1999 beating fellow winners and legends like Boris Becker and Andre Agassi multiple times in finals.
#3 Novak Djokovic
One of two active players in the list, Serbian Novak Djokovic looks to be in top gear since the start of Wimbledon rising to the top of the ATP rankings, and will start as the favorite at the ATP Finals beginning next week.
Fresh after equaling Pete Sampras' Grand Slam tally of 14, Djokovic will look to avenge his Paris Masters final defeat as he seeks to become the player with the most ATP Finals trophies. The only man in history to hold all 4 Grand Slam titles across 3 different surfaces at the same time, Djokovic is also the only player in the ATP's history to have won all 9 Masters 1000 trophies.
Djokovic won his first ATP Finals trophy in 2008, the same year he grabbed his first Grand Slam title. After that, he won 4 consecutive titles in 2012, 2013, 2014 and 2015 making him the only man in the tournament's history to have won 4 in a row. In all, Djokovic has 5 titles till date.
#2 Ivan Lendl
Ivan Lendl is the only man in the list to have enjoyed stupendous success as a player and later as a coach. With 94 Singles titles, he is third in the all-time list of players with the most ATP titles only behind Roger Federer and Jimmy Connors.
Lendl won 8 Grand Slam Singles titles and also was coach of Andy Murray when he became the Number 1 ranked player. Lendl will look to guide Alexander Zverev to victory next week. Lendl like Sampras and Djokovic has won the ATP Finals 5 times.
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