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. 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 Porto Open is a professional tennis tournament played on outdoor hard courts. It is currently part of the ATP Challenger Tour and the ITF Women's World Tennis Tour, and has been held annually at the Complexo Ténis Monte Aventino in Porto, Portugal, since 1999 for women and since 2007 for men.
Marcelo Fedrizzi Demoliner is a Brazilian professional tennis player, who specializes in doubles. He reached a career-high doubles ranking of world No. 34 in November 2017. Demoliner has won five doubles titles.
Daniel Dutra da Silva is a professional tennis player from Brazil who competes mostly on the ATP Challenger Tour.
Gianluigi Quinzi, is a former tennis player from Italy. On 15 April 2019 he reached his career-high singles ranking of World No. 142 on the ATP World Tour rankings. He reached his career high ranking of No. 1 in ITF Juniors rankings on 1 January 2013.
The Aberto de Tênis do Rio Grande do Sul was a tennis tournament held in Porto Alegre, Brazil since 2012. The event has been part of the ATP Challenger Tour from 2012 until 2015 and was played on clay courts.
The 2012 Aberto de Tênis do Rio Grande do Sul was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Porto Alegre, Brazil between 22 and 28 October 2012.
The 2012 ATP Challenger Tour Finals was a tennis tournament played at the Ginásio do Ibirapuera in São Paulo, Brazil, between November 27 and December 1, 2012. It was the second edition of the event. It was run by the Association of Tennis Professionals (ATP) and was part of the 2012 ATP Challenger Tour. The event took place on indoor hard courts. It served as the season ending championships for players on the ATP Challenger Tour. The seven best players of the season and a wild card awardee qualified for the event and were split into two groups of four. During this stage, players competed in a round robin format. The two players with the best results in each group progressed to the semifinals where the winners of a group faced the runners-up of the other group. This stage, however, was a knock out stage.
The 2013 Aberto de Tênis do Rio Grande do Sul was a professional tennis tournament played on Clay. It was the Second edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Porto Alegre, Brazil between 23 and 29 September 2013.
Quentin Halys is a French professional tennis player. Halys has a career-high ATP singles ranking of world No. 61 achieved on 16 January 2023 and a doubles ranking of No. 129 achieved on 3 October 2022. He has won seven singles titles on the ATP Challenger Tour and seven in doubles.
The 2014 Aberto de Tênis do Rio Grande do Sul was a professional tennis tournament played on clay courts. It was the third edition of the tournament which was part of the 2014 ATP Challenger Tour. It took place in Porto Alegre, Brazil between 22 and 28 September 2014.
Yosuke Watanuki is a Japanese professional tennis player. He has a career-high ATP ranking of World No. 72 achieved on 30 October 2023 and a doubles ranking of No. 374 achieved on 7 January 2019. He is currently the No. 3 Japanese player.
The 2015 Aberto de Tênis do Rio Grande do Sul was a professional tennis tournament played on clay courts. It was the fourth edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Porto Alegre, Brazil between 28 September and 4 October 2015.
Nick Hardt is a Dominican professional tennis player. He has a career high ATP singles ranking of world No. 193 achieved on 27 May 2024 and a doubles ranking of No. 282 achieved on 24 August 2023.
Alexei Popyrin is an Australian professional tennis player. He has a career-high ATP singles ranking of No. 38 achieved on 26 February 2024. He also has a career-high ATP doubles ranking of No. 235 achieved in June 2022. He is currently the No. 4 Australian singles player. He has won two singles titles on the ATP Tour.
Evan Furness is a French professional tennis player.
The 2021 Porto Open was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Porto, Portugal between 28 June and 4 July 2021.
The 2022 Porto Open was a professional tennis tournament played on hard courts. It was the second edition of the tournament which was part of the 2022 ATP Challenger Tour. It took place in Porto, Portugal between 4 and 10 July 2022.
Jairo Velasco Sr. 
Juan Avendaño 
Christian Bergström 
Alex Antonitsch 
Paul Dogger 
Andrei Cherkasov 
Franco Davín 
Stefano Pescosolido 
Bart Wuyts 
Martin Wostenholme 
Claudio Mezzadri 
Younes El Aynaoui 
Marcelo Filippini 
Richard Fromberg 
