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.
The Nottingham Trophy was an annual tennis tournament played in Nottingham, England. The tournament was part of the ATP Challenger Tour and the International Tennis Federation as a $75,000 event. The tournament's key sponsor was Dutch insurance firm Aegon. The tournament was held at the end of May before the main tour's grass-court season starts.
The Columbus Open, also known as the Buckeye Tennis Championships or Buckeye Open, is a defunct affiliated men's tennis tournament played from 1970 to 1984 in Columbus, Ohio, in the United States. The inaugural edition in 1970 was an invitational tournament with eight top independent professional players. It was played on synthetic hard court at the newly created 3,200-seat stadium at the Buckeye Boys Ranch in Grove City, a suburb of Columbus. From 1971 until 1984 the tournament was part of the Grand Prix circuit. The tournament was played on outdoor clay courts from 1971 to 1979, and then played on outdoor hard courts from 1980 to 1984.
WTA 125 tournaments are an international series of professional women's tennis tournaments organized by the Women's Tennis Association since 2012.
Yoshihito Nishioka is a Japanese professional tennis player. He has won three ATP Tour singles titles and achieved a career-high ATP singles ranking of world No. 24 on 19 June 2023. He is currently the No. 1 Japanese player.
Stefan Kozlov is an American professional tennis player of Russian descent. He has a career-high ATP ranking of world No. 103 achieved on 18 July 2022 and doubles ranking of world No. 180 on 19 June 2017.
Mikael Torpegaard is a Danish professional tennis player, who as of April 2022 is the second highest ranked male tennis player from Denmark behind Holger Rune. Mikael Torpegaard is a member of the Denmark Davis Cup team.
The 2015 Columbus Challenger was a professional tennis tournament played on indoor hard courts. It was the first edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Columbus, United States between 21 and 27 September 2015.
Jeffrey John "J. J." Wolf is an American professional tennis player. He has a career-high ATP singles ranking of world No. 39, achieved on 13 February 2023. Wolf played collegiately at Ohio State University.
The 2016 Columbus Challenger 1 was a professional tennis tournament played on indoor hard courts. It was the second edition of the tournament which was part of the 2016 ATP Challenger Tour. It took place in Columbus, United States between 19 and 25 September 2016.
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 2016 Columbus Challenger 2 was a professional tennis tournament played on indoor hard courts. It was the third edition of the tournament which was part of the 2016 ATP Challenger Tour. It took place in Columbus, United States between 21 and 27 November 2016.
The 2019 Columbus Challenger was a professional tennis tournament played on indoor hard courts. It was the sixth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Columbus, United States between 7 and 13 January 2019.
The 2019 Columbus Challenger II was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Columbus, United States between 10 and 16 June 2019.
The 2019 Columbus Challenger III was a professional tennis tournament played on hard courts. It was the eighth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Columbus, United States between 16 and 22 September 2019.
The 2020 Columbus Challenger was a professional tennis tournament played on hard courts. It was the ninth edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Columbus, United States between 24 February and 1 March 2020.
The 2021 Columbus Challenger was a professional challenger level tennis tournament played on indoor hard courts. It was the tenth edition of the men's tournament which was part of the 2021 ATP Challenger Tour and the first edition of the women's event, that was part of 2021 WTA 125K series. It took place in Columbus, United States between 20 and 26 September 2021.
The 2022 Columbus Challenger was a professional tennis tournament played on indoor hard courts. It was the eleventh edition of the men's tournament which was part of the 2022 ATP Challenger Tour. It took place in Columbus, United States between January 24 and 30 2022.
The 2022 Columbus Challenger II was a professional tennis tournament played on indoor hard courts. It was the twelfth edition of the men's tournament which was part of the 2022 ATP Challenger Tour. It took place in Columbus, United States between September 19 and 25, 2022.
2022 Columbus Challenger 
Yoshihito Nishioka 
Tennys Sandgren 
Mikael Torpegaard 
