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 Tampere Open is a professional tennis tournament played on clay courts. It is currently part of the ATP Challenger Tour, and has been held annually at the Tampere Tennis Center in Tampere, Finland, since 2008. Prior to that ATP Challenger competition was held at the Pyynikki tennis courts from 1982–2007.
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.
João Olavo Soares de Souza is a Brazilian former professional tennis player. Before receiving a lifetime ban for match-fixing, Souza competed mainly on the ATP Challenger Tour, both in singles and doubles. He reached his highest ATP singles ranking, No. 69, on April 6, 2015, and his highest ATP doubles ranking, No. 70, on January 7, 2013. Souza was coached by former Brazilian player Ricardo Acioly. Souza is also known as "Feijão".
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.
The BMW Ljubljana Open is a professional tennis tournament played on outdoor clay courts. It is currently part of the WTA 125 series of the WTA Tour. In the past, the Association of Tennis Professionals (ATP) organized an ATP Challenger which was last held in 2011. The tournament was first held in 1990 in Domžale, Slovenia, before moving to Ljubljana from 2002.
Emilio Gómez Estrada is an Ecuadorian professional tennis player competing primarily on the ATP Challenger Tour. On 20 February 2023, he reached his highest ATP singles ranking of world No. 90 and a doubles ranking of world No. 254, achieved on 14 September 2015. He is currently the No. 3 Ecuadorian tennis player.
The Emami Kolkata Open ATP Challenger Tour is a professional tennis tournament played on outdoor hard courts. It is currently part of the ATP Challenger Tour. It is held annually at the Bengal Tennis Association Stadium in Kolkata, India since 2014.
The Delhi 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 Circuit. Since 2014, it has been held annually at the R.K. Khanna Tennis Complex in New Delhi, India.
The Internazionali di Tennis San Marino Open is a professional tennis tournament played on red clay. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour and has been held annually in San Marino since 1988. For the first three years it was held at Centro Sportivo Serravalle before moving to its current home in 1991, the Centro Tennis Cassa di Risparmio di Fonte dell'Ovo in the City of San Marino.
The 2017 ATP World Tour was the global elite men's professional tennis circuit organized by the Association of Tennis Professionals (ATP) for the 2017 tennis season. The 2017 ATP World Tour calendar comprised the Grand Slam tournaments, the ATP World Tour Masters 1000, the ATP Finals, the ATP World Tour 500 series, the ATP World Tour 250 series and the Davis Cup. Also included in the 2017 calendar are the Hopman Cup and the Next Gen ATP Finals, which do not distribute ranking points.
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.
Federico Coria is an Argentine professional tennis player. He has a career-high ATP singles ranking of No. 49 achieved on 13 February 2023. He also has a career-high doubles ranking of No. 238, achieved on 22 November 2021. Coria has won six ATP Challenger singles titles and one doubles title.
The Kunal Patel San Francisco Open is a professional tennis tournament played on outdoor hard courts. It is currently part of the ATP Challenger Tour. It is held annually in San Francisco, United States since 2017. The inaugural event was held February 2017, at the Bay Club SF Tennis Center, the West Coast's largest indoor tennis facility. Since 2021, the tournament has been held at the Lisa and Douglas Goldman Tennis Center in San Francisco, CA.
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 2019 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2019 tennis season. The 2019 ATP Tour calendar comprised the Grand Slam tournaments, the ATP Tour Masters 1000, the ATP Finals, the ATP Tour 500 series, the ATP Tour 250 series and Davis Cup. Also included in the 2019 calendar were the Hopman Cup, the Laver Cup and the Next Gen ATP Finals which do not distribute ranking points. For the Masters series events the ATP introduced a shot clock. Players had a minute to come on court, 5 minutes to warmup, and then a minute to commence play, as well as 25 seconds between points.
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 Emilia-Romagna Open is a professional tennis tournament played on clay courts. It is currently a WTA 125 event on the WTA Tour for women and part of the ATP Challenger Tour for men. It is held annually in Parma, Italy since 2021. Since 2024 it is held in Sassuolo, Modena for men.
2016 STRABAG Challenger Open 
