The Association of Tennis Professionals (ATP) is the governing body of the men's professional tennis circuits – the ATP Tour, the ATP Challenger Tour and the ATP Champions Tour. It was formed in September 1972 by Donald Dell, Jack Kramer, and Cliff Drysdale to protect the interests of professional tennis players, and Drysdale became the first president. Since 1990 the association has organized the ATP Tour, the worldwide tennis tour for men and linked the title of the tour with the organization's name. It is the governing body of men's professional tennis. In 1990 the organization was called the ATP Tour, which was renamed in 2001 as just ATP and the tour being called ATP Tour. In 2009 the name of the tour was changed again and was known as the ATP World Tour, but changed again to the ATP Tour by 2019. It is an evolution of the tour competitions previously known as Grand Prix tennis tournaments and World Championship Tennis (WCT). The ATP's global headquarters are in London. ATP Americas is based in Ponte Vedra Beach, Florida; ATP Europe is headquartered in Monaco; and ATP International, which covers Africa, Asia and Australasia, is based in Sydney, Australia.
Yves Allegro is a retired Swiss professional tennis player. He is a doubles specialist and is well known as compatriot Roger Federer's doubles partner and friend. Allegro and Federer teamed up in doubles at the Australian Open in 2003 and 2004.
The Switzerland men's national tennis team represents Switzerland in the Davis Cup tennis competition and is governed by Swiss Tennis.
The Lithuania men's national tennis team represents Lithuania in Davis Cup tennis competition and are governed by the Lithuanian Tennis Association.
Andrei Luzgin is a tennis coach and former Estonian tennis player. He achieved his career high ATP singles ranking in 1996 at No. 1212. The same year he also achieved his career high doubles ranking at No. 844.
Rene Busch is a tennis coach and former Estonian tennis player. He achieved his career high ATP ranking in 1995 on No.793.
Jürgen Zopp is an Estonian retired tennis player. He is Estonia's all-time highest ranked male tennis player with a career-high singles ranking of World No. 71 in 2012.
Vladimir Ivanov is an Estonian tennis player.
Andres Võsand is a former professional tennis player from Estonia. He represented the Soviet Union for most of his career, but was based in West Germany, then in 1995 took up German citizenship.
Dimitar Kuzmanov is a Bulgarian professional tennis player. He competes on the ATP Challenger Tour. His highest singles ranking is No. 159 achieved on 29 August 2022, whilst his best doubles ranking is No. 438 achieved on 1 April 2019.
Toomas Leius is a former tennis player from Estonia who competed for the Soviet Union.
Henri Joona Julius Laaksonen is a Swiss inactive professional tennis player. His highest singles ranking is world No. 84, which he achieved on 14 February 2022, and his highest doubles ranking is world No. 191, achieved on 24 December 2018.
Kenneth Raisma is an Estonian tennis player.
Mattias Siimar is an Estonian tennis player.
Adam Chadaj is a professional tennis player from Poland.
Rrezart Cungu is a Montenegrin tennis player.
Kristjan Tamm is an Estonian 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.
Daniil Glinka is an Estonian tennis player.
Mark Lajal is an Estonian tennis player. He has a career high ATP singles ranking of world No. 191, achieved on 20 November 2023. He also has a career high ATP doubles ranking of No. 710, achieved on 9 September 2024. He is currently the No. 1 Estonian player.
Estonia 
