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 Challenger Tour, known until the end of 2008 as the ATP Challenger Series, is a series of international men's professional tennis tournaments. The Challenger Tour events are the second-highest tier of tennis competition, behind the ATP Tour. The ITF World Tennis Tour tournaments are on the entry-level of international professional tennis competition. The ATP Challenger Tour is administered by the Association of Tennis Professionals. Players who succeed on the ATP Challenger Tour earn sufficient ranking points to become eligible for main draw or qualifying draw entry at ATP Tour tournaments. Players on the Challenger Tour are usually young players looking to advance their careers, those who fail to qualify for ATP events, or former ATP players looking to get back into the big tour.
Ruben Bemelmans is a Belgian former professional tennis player. He has a career-high ATP ranking of world No. 84 in singles, achieved on 28 September 2015, and world No. 128 in doubles, achieved on 1 October 2012. Bemelmans competed mainly on the ATP Challenger Tour.
Kimmer Coppejans is a Belgian tennis player. His highest ATP singles ranking is world No. 97, achieved in June 2015. Coppejans competes mainly on the ATP Challenger Tour circuit. He is currently the No. 3 Belgian singles tennis player.
Roman Rishatovich Safiullin is a Russian professional tennis player. Safiullin has a career high ATP singles ranking of world No. 36 achieved on 8 January 2024, and in doubles of world No. 239 achieved on 7 February 2022.
Jan Choinski is a Polish-German-British tennis player. Choinski has a career high ATP singles ranking of world No. 126, achieved on 21 August 2023. He represented Germany from the beginning of his career until the end of 2018 and then switched to Great Britain.
The Monterrey Challenger is a professional tennis tournament played on hard courts. It is currently part of the ATP Challenger Tour. It is held annually in Monterrey, Mexico since 2015.
The 2017 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the first edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Koblenz, Germany between 17 and 22 January 2017.
André Göransson is a Swedish tennis player. He has a career-high ATP singles ranking of world No. 773, achieved on 25 September 2017, and in doubles a ranking of world No. 55, achieved on 3 April 2023. He is the current No. 1 Swedish doubles player. Göransson has won seven ATP Challenger doubles titles and two Futures doubles titles.
The 2018 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the second edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Koblenz, Germany between 16 and 21 January 2018.
Mats Hans Moraing is a German professional tennis player. He achieved his career high ATP singles ranking of world No. 115 on 23 May 2022.
Benjamin Hassan is a Lebanese-German tennis player. He has a career high ATP singles ranking of world No. 149, achieved on 13 November 2023.
The Oracle Challenger Series – Houston is a professional tennis tournament played on hard courts. It is currently part of the ATP Challenger Tour and the Women's Tennis Association (WTA) 125K series. It is held annually in Houston, United States since 2018. The ATP Challenger Tour returned to Houston, Texas for the first time since 2001, with the inaugural Oracle Challenger Series Houston making its debut in November. Held on the campus of Rice University, at the new $9 million George R. Brown Tennis Complex. Houston is will become one of just two U.S. cities to host tournaments on both the ATP World Tour and ATP Challenger Tour, with the ATP World tour tournament being the U.S. Men's Clay Court Championships. The Oracle Challenger Series – Houston is the second stop for the Oracle Challenger Series calendar. The winner of the Oracle Challenger Series earns a wild card into Indian Wells Masters.
The Da Nang Tennis Open was a professional tennis tournament played on hard courts. It was part of the ATP Challenger Tour. It was held in Da Nang, Vietnam in 2019.
The 2019 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the third edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Koblenz, Germany between 14 and 20 January 2019.
The Emilia-Romagna Open is a professional tennis tournament played on clay courts. It is currently part of the WTA Tour for women and minor league ATP Challenger Tour for men. It is held annually in Montechiarugolo, Parma, Italy since 2021 and 2019.
Fabien Reboul is a French professional tennis player who plays mainly doubles. He has a career-high ATP singles ranking of World No. 328 achieved on 17 December 2018. He also has a career-high doubles ranking of World No. 31 achieved on 4 March 2024. Reboul has won has won two ATP Tour doubles titles and 15 ATP Challengers, all partnering Sadio Doumbia.
The 2020 Koblenz Open was a professional tennis tournament played on indoor hard courts. It was the fourth edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Koblenz, Germany from 17 to 23 February 2020.
Tomáš Macháč is a Czech professional tennis player. He achieved his career-high ATP singles ranking of world No. 43 on 1 April 2024 and doubles ranking of No. 86 on 12 February 2024. He is currently the No. 2 Czech player.
Hazem Naw is a Syrian tennis player.
Ruben Bemelmans 
Nils Langer 
Kenny de Schepper 
Gianluca Mager 
Roberto Ortega Olmedo 
Tomáš Macháč 
Botic van de Zandschulp 
Roman Safiullin 
Vasek Pospisil 
Jurij Rodionov 
Brandon Nakashima 
Hans Podlipnik 
Andrei Vasilevski 
Romain Arneodo 
Antonio Šančić 
Filip Polášek 
Denys Molchanov 
