The 2011 Madrid Masters (also known as the Mutua Madrid Open for sponsorship reasons) was played on outdoor clay courts at the Park Manzanares in Madrid, Spain from 30 April – 8 May. It was the 10th edition of the event on the ATP and 3rd on the WTA. It was classified as an ATP World Tour Masters 1000 event on the 2011 ATP World Tour and a Premier Mandatory event on the 2011 WTA Tour.

Ion Ţiriac, the former Romanian ATP player and now billionaire businessman, was the owner of the tournament.

The following players received wildcards into the main draw:

The following players received entry from the qualifying draw:

The following players received wildcards into the main draw:

The following players received entry from the qualifying draw:

The following notable players withdrew from this event:

Novak Djokovic def. Rafael Nadal, 7–5, 6–4

Petra Kvitová def. Victoria Azarenka, 7–6(3), 6–4

Bob Bryan / Mike Bryan def. Michaël Llodra / Nenad Zimonjić, 6–3, 6–3

Victoria Azarenka / Maria Kirilenko def. Květa Peschke / Katarina Srebotnik, 6–4, 6–3.

The Madrid Open , currently sponsored by Mutua, is a male and female professional tennis tournament, currently held in Madrid, Spain, during the first week of May. The event is classified as an ATP World Tour Masters 1000 event on the Association of Tennis Professionals tour and a Premier Mandatory event on the Women's Tennis Association tour. In the past it has also been known as the Mutua Madrileña Madrid Open and before that the Madrid Masters. As of 2012, it is the only tournament on the ATP tour to be played on blue clay.

Ion Ţiriac the former Romanian ATP player and now billionaire businessman is the current owner of the tournament.

From 1990 through 2008, the tournament was classified as an ATP Masters Series event on the men's tour. The event was held in Essen, Germany in 1995 and Stockholm, Sweden from 1990 through 1994. When the tournament moved from Stockholm to Essen, the Stockholm Open continued as an ATP World Series tournament. From 1996 through 2001, the event was held in Stuttgart, Germany and from 2002 through 2008 at the Madrid Arena. The tournament was played from 1990 through 2008 on indoor hardcourts. In 2009, the surface became clay courts, the venue was changed to the Park Manzanares, and the tournament was expanded to include WTA professionals.

Madrid (English /məˈdrɪd/, Spanish: [ma'ðrid]) is the capital and largest city of Spain. The population of the city is roughly 3.3 million and the entire population of the Madrid metropolitan area is calculated to be 6.271 million. It is the third largest city in the European Union, after London and Berlin, and its metropolitan area is the third largest in the European Union after London and Paris. The city spans a total of 604.3 km² (233.3 sq mi).

The city is located on the Manzanares river in the centre of both the country and the Community of Madrid (which comprises the city of Madrid, its conurbation and extended suburbs and villages); this community is bordered by the autonomous communities of Castile and León and Castile-La Mancha. As the capital city of Spain, seat of government, and residence of the Spanish monarch, Madrid is also the political centre of Spain. The current mayor is Ana Botella from the People's Party (PP).

Madrid urban agglomeration has the 3rd largest GDP in the European Union and its influences in politics, education, entertainment, environment, media, fashion, science, culture, and the arts all contribute to its status as one of the world's major global cities. Due to its economic output, high standard of living, and market size, Madrid is considered the major financial centre of Southern Europe and the Iberian Peninsula; it hosts the head offices of the vast majority of the major Spanish companies, such as Telefónica, Iberia or Repsol. Madrid is the most touristic city of Spain, the fourth-most touristic of the continent, and is the 10th most livable city in the world according to Monocle magazine, in its 2010 index. Madrid also ranks among the 12 greenest European cities in 2010. Madrid is currently a Candidate City for the 2020 Summer Olympics.

Rafael "Rafa" Nadal Parera (Catalan: [rəˈfɛɫ nəˈðaɫ pəˈɾeɾə]; Spanish: [rafaˈel naˈðal paˈɾeɾa]) (born 3 June 1986) is a Spanish professional tennis player and a former World No. 1. As of 28 May 2012 (2012 -05-28)^[update], he is ranked No. 2 by the Association of Tennis Professionals (ATP). He is widely regarded as one of the greatest players of all time; his success on clay has earned him the nickname "The King of Clay", and has prompted many experts to regard him as the greatest clay court player of all time.

Nadal has won ten Grand Slam singles titles, including a record six French Open titles (tied with Bjorn Borg), the 2008 Olympic gold medal in singles, a record 21 ATP World Tour Masters 1000 tournaments, and also was part of the Spain Davis Cup team that won the finals in 2004, 2008, 2009 and 2011. He completed the Career Grand Slam by winning the 2010 US Open, being the seventh player in history, and the youngest in the open era, to achieve it. He is the second male player to complete the Career Golden Slam (winner of the four grand slams and the Olympic Gold medal) after only Andre Agassi.

Novak Djokovic (Serbian: Новак Ђоковић or Novak Đoković; pronounced [nɔ̂ʋaːk dʑɔ̂ːkɔʋitɕ] ( listen); born 22 May 1987) is a Serbian professional tennis player who has been ranked World No. 1 by the Association of Tennis Professionals (ATP) since 4 July 2011. He has won five Grand Slam singles titles: the 2008, 2011 and 2012 Australian Open, the 2011 Wimbledon Championships, and the 2011 US Open. By winning three Majors in 2011, Djokovic became the sixth male player in the open era to win three Majors in a calendar year.

He is the first male player representing Serbia to win a Major singles title and the youngest player in the open era to have reached the semifinals of all four Grand Slam events, separately and consecutively. Amongst other titles, he won the Tennis Masters Cup in 2008 and was on the team which won the 2010 Davis Cup. He also won the bronze medal in singles at the Beijing Olympics in 2008. He has won 11 Masters 1000 series titles placing him joint fourth on the all time list. Djokovic has quickly moved up in the rankings of history. Tennis Channel ranked him number 40 , and former player Pat Cash said he is one of the greatest ever.