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 2001 Tennis Masters Cup was a men's tennis tournament played on indoor hard courts. It was the 32nd edition of the year-end singles championships and was part of the 2001 ATP Tour. The tournament was held at the Sydney Superdome in Sydney, Australia from 12 November through 18 November 2001. The doubles competition was set to take place in Bangalore, India but was cancelled because of security fears following the September 11 attacks. A competition was held in early 2002, but it did not provide any ranking points and was held as the ATP World Doubles Challenge Cup. Lleyton Hewitt won the singles title.
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.
Rohan Machanda Bopanna is an Indian professional tennis player who specializes in doubles. He attained the world No. 1 ranking after winning his first major doubles title at the 2024 Australian Open with Matthew Ebden, becoming the oldest first-time No. 1 at the age of 43.
Somdev Kishore Devvarman is an Indian former professional tennis player. He hit the headlines for being the only collegiate player to have made three consecutive finals at the NCAA, winning back-to-back finals in his junior and senior years at the University of Virginia. Only three other players have matched that record since 1950. His 44–1 win–loss record in 2008 at the NCAA Men's Tennis Championship is unprecedented.
Harsh Mankad is a former world ranked ATP Professional tennis player from India. He played Davis Cup for India between 2001–2010 and was the No. 1 singles player on the team for several of those years.
The 2001 Touchtel ATP World Doubles Challenge Cup was a tennis tournament played on outdoor hard courts. It was the 28th edition of the year-end doubles championships and was part of the 2001 ATP Tour. The tournament was held at the KSLTA Tennis Centre in Bangalore in India from 28 January through 3 February 2002.
Purav Raja is an Indian tennis player. He specializes in doubles and competes on the ATP World Tour. He has won two ATP doubles titles and represents India in the Davis Cup.
James Duckworth is an Australian professional tennis player. He has a career-high ATP singles ranking of World No. 46 achieved on 31 January 2022 and No. 185 in doubles achieved on 10 February 2020. Duckworth represented Australia in tennis at the 2020 Tokyo Olympics and the 2022 ATP Cup.
Divij Sharan is an Indian professional tennis player. He specialises in doubles and competes on the ATP World Tour. He has won five ATP doubles titles and represents India in the Davis Cup. He won a gold medal in the men's doubles at the 2018 Asian Games.
The 2014 State Bank of India ATP Challenger Tour was a professional tennis tournament played on outdoor hard courts. It is the first edition of the tournament for the men. It was part of the 2014 ATP Challenger Tour. It took place in Kolkata, India, from 10–15 February 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 Indore Open ATP Challenger was a tennis tournament held in Indore, India. The event was part of the ATP Challenger Tour and was played on hard courts. It was only played in 2014.
Vijay SP Natarajan is an Indian professional tennis player. He has a career-high ATP doubles ranking of No. 80 achieved on 29 January 2024. He also has a career-high ATP singles ranking of No. 335 achieved on 5 October 2015.
The 2015 Emami Kolkata Open ATP Challenger Tour was a professional tennis tournament played on hard courts. It was the 2nd edition of tournament which was part of the 2015 ATP Challenger Tour. It took place in Kolkata, India between 23 and 28 February 2015.
Danilo Petrović is an inactive Serbian tennis player.
The Bengaluru Open is a professional tennis tournament played on hard courts. It is currently part of the ATP Challenger Tour. It is held annually in Bangalore, India since 2015.
Tseng Chun-hsin, also known as Jason Tseng, is a Taiwanese tennis player. He has a career-high singles ranking of world No. 83 by the ATP, achieved on 8 August 2022. Tseng is currently the No. 1 Taiwanese tennis player.
The 2020 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2020 tennis season. The 2020 ATP Tour calendar was composed of the Grand Slam tournaments, the ATP Finals, the ATP Masters 1000, the ATP Cup, the ATP 500 series, the ATP 250 series, and the Davis Cup. Also included in the 2020 calendar were the tennis events at the Next Generation ATP Finals, and the Laver Cup, neither of which distributed ranking points. Several tournaments were suspended or postponed due to the COVID-19 pandemic, including the Summer Olympics in Tokyo. On 17 June 2020, ATP issued the revised calendar for Tour resumption.
The 2023 International Tennis Federation (ITF) Men's World Tennis Tour is an entry-level tour for Men's professional tennis. It is organized by the International Tennis Federation and is a tier below the ATP Challenger Tour. The Men's Tour includes tournaments with prize money of either $US15,000 or $25,000. The results of ITF tournaments are incorporated into the ATP ranking, which enables professionals to progress to the ATP Challenger Tour and ATP Tour, and ultimately the Grand Slams. It offers approximately 550 tournaments across 70 countries.
2015 Emami Kolkata Open ATP Challenger Tour 
