The 2006 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2006 tennis season. The ATP Tour is the elite tour for professional tennis organized by the Association of Tennis Professionals. The ATP Tour includes the four Grand Slam tournaments, the Tennis Masters Cup, the ATP Masters Series, the International Series Gold and the International Series tournaments.
Gonzalo Escobar is an Ecuadorian tennis player. His career-high doubles ranking is World No. 38, achieved on 15 November 2021. He has won three doubles titles with Uruguayan partner Ariel Behar. Escobar has a career high ATP singles ranking of No. 281 achieved on 15 June 2015.
Dean Kevin O'Brien is a South African tennis player. He played college tennis for the Georgia Tech Yellow Jackets.
Hans Hach Verdugo is a Mexican tennis player.
Nicolás Álvarez is a Peruvian tennis player.
Joris De Loore is a Belgian tennis player. De Loore has a career high ATP singles ranking of 174 achieved on 17 October 2016. He also has a career high ATP doubles ranking of 263, achieved on 24 December 2018. De Loore has won one Challenger, eleven ITF singles titles and one Challenger, fourteen ITF doubles titles. He competes mainly on the ATP Challenger Tour.
Altuğ Çelikbilek is a Turkish professional tennis player.
Zsombor Piros is a Hungarian tennis player.
Courtney John Lock is a Zimbabwean tennis player.
Moez Echargui is a Tunisian tennis player.
Rafael Fabris de Matos is a Brazilian professional tennis player.
The 2021 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2021 tennis season. The 2021 ATP Tour calendar comprised the Grand Slam tournaments, the ATP Finals, the ATP Tour Masters 1000, the ATP Cup, the ATP Tour 500 series and the ATP Tour 250 series. Also included in the 2021 calendar were the Davis Cup, the Summer Olympics in Tokyo, Next Gen ATP Finals, Laver Cup, none of which distributed ranking points.
Kareem Al Allaf is an American tennis player of Syrian descent.
Michail Pervolarakis is a Cypriot-born Greek tennis player.
Mehdi Ziadi is a former Moroccan tennis player.
Jan Zieliński is a Polish professional tennis player who specializes in doubles. He has an ATP career-high doubles ranking of world no. 15, which he attained on 30 January 2023 following the 2023 Australian Open final. His highest ranking in singles has been no. 769, achieved on 20 September 2021.
Roy Hobbs is a Singaporean tennis player.
Yuta Shimizu is a Japanese tennis player.
Vladyslav Orlov is a Ukrainian tennis player.
Patricio Alvarado is an Ecuadorian tennis player.
United States 
Puerto Rico (Davis Cup)
