#=1 Novak Djokovic
In addition to his tally of 15 Grand Slam singles titles, the Serb Novak Djokovic has also captured 33 ATP Masters titles. Djokovic is the only man to have won 6 ATP Masters 1000 titles in a single calendar year; he achieved this in the year 2015 when he won Indian Wells, Miami Open, Monte-Carlo Masters, Madrid Open, Rome Masters and Shanghai Masters.
In the year 2018, Djokovic completed the 'Career Golden Masters' - becoming the only man in the Open Era to have done so. He beat long-time nemesis Roger Federer at the Cincinnati Open in Ohio in the year 2018, thus completing the entire set.
Djokovic's 32nd ATP Masters 1000 victory came at the Shanghai Masters where he overtook Rafael Nadal to get to the top of the ATP rankings after a gap of more than 2 years. His 33rd and record equaling ATP Masters 1000 title at this year's Madrid Masters puts him as a strong contender to win the French Open this year.
What is the foot injury that has troubled Rafael Nadal over the years? Check here