The Association of Tennis Professionals (ATP) is the governing body of the men's professional tennis circuits – the ATP Tour, the ATP Challenger Tour and the ATP Champions Tour. It was formed in September 1972 by Donald Dell, Jack Kramer, and Cliff Drysdale to protect the interests of professional tennis players, and Drysdale became the first president. Since 1990 the association has organized the ATP Tour, the worldwide tennis tour for men and linked the title of the tour with the organization's name. It is the governing body of men's professional tennis. In 1990 the organization was called the ATP Tour, which was renamed in 2001 as just ATP and the tour being called ATP Tour. In 2009 the name of the tour was changed again and was known as the ATP World Tour, but changed again to the ATP Tour by 2019. It is an evolution of the tour competitions previously known as Grand Prix tennis tournaments and World Championship Tennis (WCT). The ATP's global headquarters are in London. ATP Americas is based in Ponte Vedra Beach, Florida; ATP Europe is headquartered in Monaco; and ATP International, which covers Africa, Asia and Australasia, is based in Sydney, Australia.
The ATP Finals is the season-ending championship of the ATP Tour. It is the most significant tennis event in the men's annual calendar after the four majors, as it features the top eight singles players and top eight doubles teams based on their results throughout the season. The eighth spot is reserved, if needed, for a player or team who won a major in the current year and is ranked from ninth to twentieth.
The Queen's Club Championships is an annual tournament for men's tennis, held on grass courts at the Queen's Club in West Kensington, London. The event is part of the ATP Tour 500 series on the Association of Tennis Professionals (ATP) Tour. It is currently advertised as the "cinch Championships" after its title sponsor.
The Italian Open is an annual professional tennis tournament held in Rome, Italy. It is played on clay courts at the Foro Italico, and is held during the second week of May. The tournament is part of the ATP Masters 1000 events on the ATP Tour and part of the WTA 1000 events on the WTA Tour. The two events were combined in 2011. Rafael Nadal has won the men's singles title a record ten times.
The ITF Grand Prix Circuit was a professional tennis tour for male players that existed founded in 1970 as the ILTF Grand Prix Tennis Circuit it ran annually until 1989 when it and WCT Circuit were replaced by a single world wide ATP Tour.
World Championship Tennis (WCT) was a tour for professional male tennis players established in 1968 and lasted until the emergence of the ATP Tour in 1990. A number of tennis tournaments around the world were affiliated with WCT and players were ranked in a special WCT ranking according to their results in those tournaments.
The Swiss Open Gstaad is a tennis tournament held in Gstaad, Switzerland. The tournament is played on outdoor clay courts. Between 1971 and 1989 it was an event of the Grand Prix tennis circuit and is now a part of the ATP Tour schedule as an ATP Tour 250 series event.
The Argentina Open or Abierto Argentino is an annual tennis event for male tennis players held in Buenos Aires, Argentina. The tournament was established in 1927 as the Argentina International Championships and was a combined men's and women's event from 1928 until 1987 when the women's tournament was discontinued. The men's tournament is an ATP Tour 250 event on the ATP Tour, and is played on outdoor clay courts at the 5,500 capacity Buenos Aires Lawn Tennis Club, in the Palermo barrio (neighbourhood). Usually held in February, it includes both a men's singles and a men's doubles tournament. Between 1970 and 1989 it was part of the Grand Prix tennis circuit and a Grand Prix Super Series event (1970–71).
The Stuttgart Open is an ATP Tour 250 series professional tennis tournament on the ATP Tour. From 1970 to 1989, the Stuttgart Open was a Grand Prix tennis circuit event. From 1990 to 1999, the Stuttgart Open was an ATP Championship Series tournament. The Championship Series name was changed to ATP International Series Gold in 2000, and the Stuttgart Open was a part of this series from 2000–2001 and 2003–2008. In 2002, the Stuttgart Open was briefly demoted for one year to ATP International Series status, which was renamed to the ATP Tour 250 in 2009, and it has retained the classification ever since.
The Barcelona Open is an annual tennis tournament for male professional players. The event was founded in 1953 as a combined men's and women's tournament until 1980. It is played at the Real Club de Tenis Barcelona, Barcelona, Spain on clay courts. The event is commonly known as Trofeo Conde de Godó.
The Milan Indoor, also known under various sponsored names, was a men's professional tennis tournament held from 1978 until 2005. It took placed in Milan, Italy with the exception of three years (1998–2000) when it was held in London, United Kingdom. The event was part of the Grand Prix circuit (1981–89) and ATP Tour (1990–2005) and was played on indoor carpet courts, except for the 2000 edition which was played on an indoor hard court. The most successful singles players were John McEnroe and Boris Becker who both won four titles. Stefan Edberg and Roger Federer won the first singles title of their career at the event. A single female edition of the event was held in 1991, won by Monica Seles. Due to a lack of sponsorship the tournament was replaced on the 2006 ATP Tour by the Zagreb Indoors.
The Volvo International, also known as the Pilot Pen International, was a professional tennis tournament founded in 1972 as the Bretton Woods WCT it was played on clay courts to 1984 and on outdoor hard courts from 1985 to 1998. It was first held at the Mount Washington Resort in Bretton Woods, New Hampshire in the United States in 1973 after Rod Laver had run a successful summer camp there. The International was originally part of the Grand Prix tennis circuit until the formation of the ATP Tour in 1990, when it became part of the Championship Series until its dissolution.
The Nice French Riviera Open was an ATP World Tour 250 series and, formerly, Grand Prix tennis circuit affiliated men's tennis tournament. This tournament was originally founded in 1925 as a combined event called the City of Nice Championships and remained as a combined event until 1971 and 1976 to 1978. Also known as the Nice International Championships. It was held in Nice, France at the Nice Lawn Tennis Club and played on outdoor clay courts. The last singles champion is Dominic Thiem from Austria.
The ATP São Paulo, also referred to by its sponsored names Ford Cup, Banespa Open and Sul America Open, is a defunct men's tennis tournament that was played on the Grand Prix tennis circuit from 1987 through 1989 and on the ATP Tour from 1991 through 1993. The event was held in São Paulo, Brazil and was played on outdoor hard courts from 1987 through 1992 at Hotel Transamerica, and on outdoor clay courts in 1993 at Esporte Clube Pinheiros. The tournament was a replacement for the ATP Itaparica which finished in 1990.
The Monte-Carlo Masters is an annual tennis tournament for male professional players held in Roquebrune-Cap-Martin, France, which borders on Monaco. It is played on clay courts at the Monte Carlo Country Club and is held in April. The tournament is part of the nine ATP Tour Masters 1000 events on the ATP Tour. Rafael Nadal has won the men's singles title a record eleven times.
The ATP Masters events, known as ATP Masters 1000 tournaments since 2009, are an annual series of nine tennis tournaments featuring the top-ranked players on the ATP Tour since its inception in 1990. The Masters tournaments, sitting below the Grand Slam tournaments and the year-end championships, make up the most coveted trophies on the annual ATP Tour calendar. In addition to the quadrennial Summer Olympics, they are collectively known as the 'Big Titles'.
The Madrid Open is an annual professional tennis tournament held in Madrid, Spain. It is played on clay courts at the Caja Mágica in Manzanares Park, San Fermín, and is held in late April and early May. The tournament is an ATP Masters 1000 event on the ATP Tour and a WTA 1000 event on the WTA Tour. The tournament is traditionally played on a red clay surface, though it was played on blue clay courts in 2012.
The Open Era is the current era of professional tennis. It began in 1968 when the Grand Slam tournaments allowed professional players to compete with amateurs, ending the division that had persisted since the dawn of the sport in the 19th century. The first open tournament was the 1968 British Hard Court Championships held in April, followed by the inaugural open Grand Slam tournament, the 1968 French Open, a month later. Unless otherwise sourced, all records are based on data from the Association of Tennis Professionals (ATP), the International Tennis Federation (ITF), and the official websites of the four Grand Slam tournaments. All rankings-related records are based on ATP rankings, which began in 1973. The names of active players appear in boldface.
The Rio Open, also known as the Rio Open presented by Claro for sponsorship reasons, is a tennis event on the ATP Tour and former WTA International Tournaments event. The tournament is played on outdoor clay courts at the Jockey Club Brasileiro in Rio de Janeiro, Brazil. It is the only ATP Tour 500 event in South America and the only ATP Tour event in Brazil.
The Lee-on-Solent Open was a clay court then later hard court tennis event founded in 1921. It was held at the Lee-on-Solent Lawn Tennis and Squash Club (f.1911), Lee-on-Solent, Hampshire, England through until 2000 when it was abolished.
Ilie Năstase 
Adriano Panatta 
Georges Goven 
John Feaver 
José Luis Clerc 
Raúl Ramírez 
Karl Meiler 
Vitas Gerulaitis 
Stefan Simonsson 
Sergio Casal 
Andrés Gómez 
Andrei Chesnokov 
Goran Ivanišević 
Thomas Muster 
Marcelo Filippini 
Richard Fromberg 
Félix Auger-Aliassime 
