The ATP Tour is the sole worldwide top-tier tennis tour for men organized by the Association of Tennis Professionals founded in 1990 that replaced the earlier dual Grand Prix Circuit and WCT Circuit. The second-tier tour is the ATP Challenger Tour and the third-tier is the ITF Men's World Tennis Tour. The equivalent women's organisation is the WTA Tour.
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. It was founded in 1976 when it replaced the ILTF Satellite Circuit as the second tier of tennis. 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.
Nicolás Barrientos is a Colombian professional tennis player who specializes in doubles. He reached his highest ATP doubles ranking of world No. 47 on 23 April 2024 and a singles ranking of No. 237 on 21 September 2015. Barrientos has won one ATP Tour doubles title at the 2024 Rio Open with Rafael Matos. He has also won 21 titles on the ATP Challenger Tour.
The Columbus Challenger is a professional tennis tournament played on hard courts. It is currently part of the ATP Challenger Tour and WTA 125K series. The ATP event is held annually in Columbus, Ohio, U.S., as it has been since 2015, the tournament's start. The women's edition started in 2021.
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 Hungarian Challenger Open was a professional tennis tournament played on hard courts on the ATP Challenger Tour. It was held annually in Budapest, Hungary from 2016 to 2019.
The 2017 Almaty Challenger was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2017 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 2 October and 7 October 2017.
Arjun Kadhe is an Indian tennis player. He has a career high ATP doubles ranking of No. 77 achieved on 21 October 2024. He also has a career high singles ranking of No. 328 achieved on 27 August 2018.
Timofey Dmitriyevich Skatov is a Kazakhstani tennis player. He has a career-high ATP singles ranking of World No. 123, achieved on 11 September 2023 and No. 627 in doubles, achieved on 17 July 2023. Skatov had a career-high ITF junior combined ranking of No. 1 achieved on 1 January 2018. He is the current No. 5 Kazakh player.
The Marbella Tennis Open is a professional tennis tournament played on clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour and WTA 125K series. The ATP event has been held annually in Marbella, Spain, from 2018 while the WTA edition started in 2022.
The 2018 Almaty Challenger was a professional tennis tournament played on clay courts. It was the second edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 11 and 16 June 2018.
Jurij Rodionov is an Austrian professional tennis player. He has a career high ATP singles ranking of world No. 87 achieved on 19 February 2024. He also has a career high doubles ranking of No. 254 achieved on 9 September 2024. He is currently the No. 2 Austrian player.
The 2018 Almaty Challenger 2 was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 1 and 6 October 2018.
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 2019 Almaty Challenger was a professional tennis tournament played on hard courts. It was the fourth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 3 and 9 June 2019.
Jesper de Jong is a Dutch tennis player. He has a career high ATP singles ranking of world No. 103, achieved on 12 August 2024, and a career high doubles ranking of world No. 135, achieved on 23 May 2022. De Jong has won two singles and seven doubles titles on the ATP Challenger Tour.
The 2021 Almaty Challenger was a professional tennis tournament played on clay courts. It was the fifth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 7 and 13 June 2021.
The 2021 Almaty Challenger II was a professional tennis tournament played on clay courts. It was the sixth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Almaty, Kazakhstan between 14 and 20 June 2021.
The Almaty Open is an October professional tennis tournament, held in Almaty, Kazakhstan. The tournament is held on indoor hard courts.
Gabriel Diallo is a Canadian professional tennis player. He has a career-high ATP singles ranking of world No. 87, achieved on 21 October 2024 and a doubles ranking of No. 321 achieved on 8 January 2024.
2017 Almaty Challenger 
