The ATP Tour is a worldwide top-tier tennis tour for men organized by the Association of Tennis Professionals. 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. 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 Association of Tennis Professionals (ATP) Challenger Series is the secondary professional tennis circuit organized by the ATP. The 2008 ATP Challenger Series calendar comprised 176 tournaments, with prize money ranging from $25,000 up to $150,000.
The Brawo Open, known as Nord/LB Open until 2010 and the Sparkassen Open until 2021, is a professional tennis tournament played on outdoor red clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually at the Braunschweiger Tennis- und Hockey Club in Braunschweig, Germany, since 1994.
The Sanremo Challenger, previously known as Sanremo Tennis Cup is a professional tennis tournament played on outdoor red clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually at the Circolo Tennis Sanremo in Sanremo, Italy, since 2002. After a hiatus of 10 years, it came back in 2022 with a new edition.
The Rijeka Open is a professional tennis tournament played on outdoor red clay courts. It was part of the Association of Tennis Professionals (ATP) Challenger Tour from 2007 to 2011 and was held in Rijeka, Croatia.
The Maccabi Men's Challenger was a professional tennis tournament played on outdoor hard courts. It was part of the ATP Challenger Tour. It was held at the Maccabi Tennis Club in Melbourne, Australia, in 2009.
The Lima Challenger is a professional tennis tournament played on outdoor red clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually in Lima, Peru, since 2000.
The ITF Women's World Tennis Tour, previously known as the ITF Women's Circuit, is a series of professional tennis tournaments run by the International Tennis Federation for female professional tennis players.
Reda El Amrani is a professional tennis player from Morocco. He has a career high-ranking of world No. 160 achieved in June 2010.
The 2009 Alessandria Challenger was a professional tennis tournament played on outdoor red clay courts. It was part of the 2009 ATP Challenger Tour. It took place in Alessandria, Italy between May 25–31, 2009.
The 2010 Alessandria Challenger was a professional tennis tournament played on outdoor red clay courts. It was part of the 2010 ATP Challenger Tour. It took place in Alessandria, Italy between May 24–30, 2010.
2010 Trofeo Cassa di Risparmio may refer to two ATP tennis tournament, both sponsored by Italian saving banks from Alessandria and Ascoli Piceno respectively:
The ATP Challenger Tour was the secondary professional tennis circuit organized by the Association of Tennis Professionals (ATP). The 2011 ATP Challenger Tour calendar comprised 15 top tier Tretorn SERIE+ tournaments, and approximately 150 regular series tournaments, with prize money ranging from $35,000 up to $150,000.
The 2011 Alessandria Challenger was a professional tennis tournament played on clay courts. It was the fourth edition of the tournament which is part of the 2011 ATP Challenger Tour. It took place in Alessandria, Italy between 23 and 29 May 2011.
The ATP Challenger Tour was the secondary professional tennis circuit organized by the ATP. The 2012 ATP Challenger Tour calendar comprised 15 top tier Tretorn SERIE+ tournaments, and a total of 148 tournaments, with prize money ranging from $35,000 up to $150,000.
The ATP Challenger Tour is the secondary professional tennis circuit organized by the Association of Tennis Professionals (ATP). The 2013 ATP Challenger Tour calendar comprised 149 tournaments, with prize money ranging from $35,000 up to $220,000.
2009 Trofeo Cassa di Risparmio may refer to two ATP tennis tournaments, both sponsored by Italian saving banks from Alessandria and Ascoli Piceno respectively:
Cassa di Risparmio di Alessandria was an Italian regional bank based in Alessandria, Piedmont. It was absorbed into the parent company Banca Popolare di Milano in 2012.
The 2023 ATP Tour is the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2023 tennis season. The 2023 ATP Tour calendar comprises the Grand Slam tournaments, supervised by the International Tennis Federation (ITF), the ATP Finals, the ATP Tour Masters 1000, the United Cup, the ATP 500 series and the ATP 250 series. Also included in the 2023 calendar are the Davis Cup, Next Gen ATP Finals, Laver Cup, and Hopman Cup, none of which distribute ranking points. 2023 marks the return of the ATP tournaments in China after strict COVID-19 protocols in the country.
Pablo Carreño Busta 
Björn Phau 
Carlos Berlocq 
Blaž Kavčič 
Jesse Levine 
Paolo Lorenzi 
Martin Fischer 
Jeff Coetzee 
Andreas Siljeström 
Ivan Dodig 
Guillermo Hormazábal 
Matwé Middelkoop