Tennis is one of the most popular sports in the world, with hundreds of tournaments played in the calendar year. Chief amongst them are the four Grand Slams i.e. Australian Open, Wimbledon, French Open, and US Open.
But, there are other important ATP tournaments like the ATP Masters 1000, ATP Masters 500 and ATP Masters 250. These tournaments are important in terms of ranking points as well as adding a huge amount of money to a player's overall career earning.
Recently, Roger Federer won his 100th ATP title in Dubai by beating Stefanos Tsitsipas, becoming only the second player to achieve that milestone since the Open Era started in 1968, where professionals were allowed to compete with amateurs.
#5 John McEnroe - 77
John McEnroe is an American retired tennis player who is considered one of the best players to have ever played the sport. He started playing at the age of eight and in 1978 joined the ATP Tour. McEnroe played both singles and doubles tournaments and won 77 singles titles and 78 doubles titles during his career. He also has seven Grand Slam singles titles to his name (four US Opens and three Wimbledon Championships.
The American International also won the ATP Player of the Year in 1981, 1983 and 1984. In 1994 he decided to play only doubles tournament and retired from singles tournaments. However, in 2006 he completely left the court by taking retirement from doubles as well. Currently, he works as a commentator in major tournaments.
#4 Rafael Nadal - 80
Rafael Nadal is known as the king of clay, as he has won 11 French Open titles, the most by any player. The 32-year old Spaniard has also won 80 ATP singles titles and 17 Grand Slam singles titles.
Nadal is the seventh player in the Open Era to achieve a career Grand Slam (winning all four Grand Slams). And he is the second male player, after Andre Agassi to won a career gold Grand Slam (the four Grand Slams plus the Olympic gold).
He currently ranked number two in the male singles world rankings. He turned professional when he was 15 and won his first Grand Slam in 2005, the French Open, at his first attempt.