Guillermo Vilas is an Argentine former professional tennis player. Vilas was the No. 1 of the Grand Prix seasons in 1974, 1975 and 1977, and won four Grand Slam tournaments, one year-end Masters, nine Grand Prix Super Series titles and a total of 62 ATP titles. World Tennis, Agence France-Presse and Livre d'or du tennis 1977, among other rankings and publications, rated him as world No. 1 in 1977. In the ATP computer rankings, he peaked at No. 2 in April 1975, a position he held for a total of 83 weeks. He was inducted into the International Tennis Hall of Fame in 1991, two years after his first retirement.
Horacio Armando de la Peña, nicknamed "el Pulga", is a tennis coach and a former tennis player from Argentina, who reached a career-high singles ranking of World No. 31.
Guillermo Ignacio Cañas, often referred to as Willy Cañas, is a retired tennis player from Argentina. He was born in Buenos Aires and named after Argentine tennis star Guillermo Vilas. Cañas won the Canada Masters in 2002, and reached the quarterfinal stage of the French Open in 2002, 2005 and 2007. His career-high singles ranking was world No. 8, achieved in June 2005. After being suspended in August 2005, Cañas returned to the circuit in September 2006 at ATP Challenger level.
Qaid, also spelled kaid or caïd, is a word meaning "commander" or "leader." It was a title in the Norman kingdom of Sicily, applied to palatine officials and members of the curia, usually to those who were Muslims or converts to Islam. The word entered the Latin language as Latin: gaitus or Latin: gaytus. Later the word was used in North Africa for the governor of a fortress or the warden of a prison, also in Spain and Portugal in the form with the definite article "alcayde" (Spanish) "alcaide" (Portuguese). It is also used as a male Arabic given name.
Guillermo García López is a Spanish former professional tennis player. He has won five singles titles and achieved a career-high singles ranking of world No. 23 in February 2011.
Guillermo Hormazábal is a former Chilean professional tennis player. In 2001, he became an under 16's world champion.
Alcaide is a Spanish name, meaning 'castle commander'. It is borrowed from the Arabic term qāʾid, which literally means 'commander'.
The 2009 Open Prévadiès was a professional tennis tournament played on outdoor red clay courts. It was part of the 2009 ATP Challenger Tour. It took place in Saint-Brieuc, France between 30 March and 5 April 2009.
Guillermo Olaso de la Rica is a Spanish professional tennis player.
The 2009 Prosperita Open was a professional tennis tournament played on Hard courts. It was part of the 2009 ATP Challenger Tour. It took place in Ostrava, Czech Republic between April 27 and March 3, 2009.
Players and pairs who neither have high enough rankings nor receive wild cards may participate in a qualifying tournament held one week before the annual Wimbledon Tennis Championships.
The 2009 BH Tennis Open International Cup was a professional tennis tournament played on Hard courts. This was the eighteenth edition of the tournament which is part of the 2009 ATP Challenger Tour. It took place in Belo Horizonte, Brazil between 27 July and 2 August 2009.
The 2009 Credicard Citi MasterCard Tennis Cup was a professional tennis tournament played on outdoor red clay courts. It was the ninth edition of the tournament which was part of the 2009 ATP Challenger Tour. It took place in Campos do Jordão, Brazil between 3 and 9 August 2009.
The 2010 Copa Petrobras Buenos Aires was a professional tennis tournament played on red clay courts. It was the seventh edition of the tournament which was part of the 2010 ATP Challenger Tour. It took place in Buenos Aires, Argentina between 4 and 11 October 2010.
The 2011 Morocco Tennis Tour – Casablanca was a professional tennis tournament played on clay courts. It was the first edition of the tournament which is part of the 2011 ATP Challenger Tour. It took place in Casablanca, Morocco between February 21 and 27, 2011.
Guillermo Andrés Rivera Aránguiz is a Chilean professional tennis player. Rivera will be eligible to play in Davis Cup competitions for Chile in March 2011 against the United States. He made his debut in Davis Cup singles for disputing the fifth point of the series against the United States, facing John Isner, losing him 3–6, 7–6, 5–7.
The 2011 Zagreb Open was a professional tennis tournament played on outdoor red clay courts. This event was the 16th edition of the tournament and was part of the 2011 ATP Challenger Tour and 2011 ITF Women's Circuit. It took place in Zagreb, Croatia May 9–16, 2011.
The 2011 Open Castilla y León was a professional tennis tournament played on hard courts. It was the 26th edition of the tournament which was part of the Tretorn SERIE+ of the 2011 ATP Challenger Tour. It took place in Segovia, Spain between 1 and 7 August 2011.
Guillermo Durán is an Argentine tennis player playing on the ATP Challenger Tour. On 2 April 2012, he reached his highest ATP singles ranking of 385. His highest ATP doubles ranking of 48 was achieved on 23 May 2016.
Florin Mergea and Horia Tecău were the defending champions, but they did not compete in the Juniors this year.
Spain 
