The ILTF Grand Prix tennis circuit was a professional tennis tour for male players that existed from 1970 to 1989. The Grand Prix and World Championship Tennis (WCT) were the two predecessors to the current tour for male players, the ATP Tour, with the Grand Prix being more prominent.
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 ABN AMRO Open, also known as the Rotterdam Open, and formerly known as: ABN AMRO World Tennis Tournament (1991-2021), is a professional men's tennis tournament played on indoor hard courts. It is part of the ATP Tour 500 series on the ATP Tour and has been held annually at Rotterdam Ahoy in Rotterdam, Netherlands.
The Swiss Indoors is a professional men's tennis tournament played on indoor hard courts at the St. Jakobshalle in Basel, Switzerland.
The U.S. National Indoor Championships was a tennis tournament that was last held at the Racquet Club of Memphis in Memphis, Tennessee, United States. The event was played on indoor hard courts and usually took place in February. For much of its more than 100-year history it was a combined men's and women's tournament but in 2014, its final year, only a men's tournament was held. The event was previously known under various sponsored names including the Memphis Open, the Regions Morgan Keegan Championships, the Kroger St. Jude Championship, and the Volvo Championships. It was called throughout most of its history the National Indoor Championships.
The Stockholm Open, branded by its sponsored name as the BNP Paribas Nordic Open since 2023, is a professional tennis tournament played on indoor hardcourts at the Kungliga tennishallen in Stockholm, Sweden. Since 2001, the event has been held annually in October by the Association of Tennis Professionals (ATP) as an ATP 250 tournament on the ATP Tour. The tournament is owned by The Royal Lawn Tennis Club of Stockholm, SALK and Tennis Stockholm.
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 Australian Indoor Tennis Championship, also known as the Australian Indoor Championship, the Australian Indoor Open and the Sydney Indoor for short, was a professional men's tennis tournament was played in Sydney, Australia. The tournament was an initiative from John Newcombe and was part of an expanding Asian-Australian fall Grand Prix circuit. The event was played under various names as part of the Grand Prix tennis circuit from 1973 through 1989 and as part of the ATP Tour from 1990 through 1994. It was played on indoor hard courts at the Hordern Pavilion on the Sydney Showground through 1982 and at the Sydney Entertainment Centre beginning in 1983. The tournament was cancelled in June 1994 on financial grounds with tournament director and co-founder Graham Lovett citing insufficient television coverage and the difficulty of signing top players as the main reasons.
The U.S. Professional Indoor Championships, also known as U.S. Pro Indoor, was a professional tennis tournament founded in 1962 as the Philadelphia Invitational Indoor Tennis Championships. The tournament was held in Philadelphia, United States from 1962 to 1998. It played on indoor carpet courts, and indoor hard courts. It was part of the ILTF World Circuit from 1962 to 1967 and again in 1970, the World Championship Tennis (WCT) circuit in 1968, 1969 and from 1971 to 1977 and the Grand Prix Tour from 1978 to 1989 before being held on the ATP Tour. It was held annually first at the Spectrum, and then at the CoreStates Center. It was originally named the Philadelphia Indoor Open Tournament prior to the open era.
The Dewar Cup Edinburgh was an indoor men's and women's tennis event held from 1968 to 1972, and played in Edinburgh, Scotland as part of the second leg of Dewar Cup Circuit of indoor tournaments held throughout the United Kingdom.
The Toronto Indoor was a professional men's tennis tournament played on indoor carpet courts, held at Maple Leaf Gardens. It was part of the Grand Prix tennis circuit and later, for one year, the ATP Championship Series of the ATP Tour. The tournament was established in 1972, becoming the second tournament held in Canada alongside the Canadian Open which alternated between Montreal, Quebec and Toronto, Ontario. The final event in 1990 was held at the Skydome.
The Madrid Tennis Grand Prix is a defunct professional men's tennis tournament that was played on outdoor clay courts in Madrid, Spain with the exception of the 1984 edition which was played on indoor carpet courts. It was part of the Grand Prix tennis circuit initially and later, the ATP World Series of the ATP Tour. The tournament was established in 1972 and was played every year until 1994.
The Melbourne Indoor was a men's tennis tournament played in Melbourne, Australia, from 1980 through 1985. The event was part of the Grand Prix tennis circuit and was played on indoor carpet courts.
The 1980 Volvo Grand Prix was a men's professional tennis circuit held that year. It incorporated the four grand slam tournaments, the Grand Prix tournaments. The Grand Prix circuit is a precursor to the ATP Tour.
The 1972 Commercial Union Assurance Grand Prix was a professional tennis circuit held that year and organized by the International Lawn Tennis Federation (ILTF). It consisted of 33 Grand Prix tournaments in different categories including three of the four Grand Slam tournaments and was followed by a season-ending Masters tournament. The circuit ran from February through November.
The 1972 Baltimore International was a men's tennis tournament played on indoor carpet courts at the Towson State College in Baltimore, Maryland in the United States that was part of the 1972 USLTA Indoor Circuit. It was the inaugural edition of the event and was held from January 7 through January 9, 1972. Second-seeded Ilie Năstase won the singles title and earned $2,550 first-prize money.
The 1977 Baltimore International was a men's tennis tournament played on indoor carpet courts at the Towson State College in Baltimore, Maryland in the United States that was part of the 1977 Grand Prix circuit. It was the sixth edition of the event and was held from January 17 through January 23, 1977. Second-seeded Brian Gottfried won the singles title, his second at the event after 1975, and won $20,000 first-prize money.
The 1979 Baltimore International, also known by its sponsored name First National Classic, was a men's tennis tournament played on indoor carpet courts at the Towson State College in Baltimore, Maryland in the United States that was part of the 1979 Grand Prix circuit. It was the eighth edition of the event and was held from January 15 through January 21, 1979. First-seeded Harold Solomon won the singles title and earned $13,000 first-prize money.
The 1982 Baltimore International, also known by its sponsored name First National Classic, was a men's tennis tournament played on indoor carpet courts at the Towson State College in Baltimore, Maryland in the United States that was part of the 1982 World Championship Tennis circuit. It was the tenth, and last, edition of the event and was held from November 1 through November 7, 1982. Second-seeded Paul McNamee won the singles title.
The Belgian National Indoor Championships was a combined men's and women's closed indoor tennis tournament founded in 1928 as the Belgian Closed Covered Court Championships. The tournament was first held in Brussels, Belgium, and ran annually until 1982 when it was discontinued as part of the ILTF Independent Circuit.
