Given the question: Information:  - 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.  - Tennis is a racket sport that can be played individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to play the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball will not gain a point, while the opposite player will.  - The Association of Tennis Professionals (ATP) was formed in September 1972 by Donald Dell, Bob Briner, Jack Kramer, and Cliff Drysdale to protect the interests of male professional tennis players. Drysdale became the first President. Since 1990, the association has organized the worldwide tennis tour for men and linked the title of the tour with the organization's name. 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 was changed again and is now known as the ATP World Tour. It is an evolution of the tour competitions previously known as Grand Prix tennis tournaments and World Championship Tennis (WCT).  - Felt is a textile that is produced by matting, condensing and pressing fibers together. Felt can be made of natural fibers such as wool, or from synthetic fibers such as petroleum-based acrylic or acrylonitrile or wood pulp-based rayon. Blended fibers are also common.   - Estoril Court Central is the main tennis court in Oeiras, Portugal. Built in 2005, it currently holds 10,000 spectators. It annually hosts the Portugal Open in May.  - The Portugal Open (formerly named Estoril Open) was an ATP and WTA clay court tennis tournament in Portugal. The event took place at the sports complex of Jamor in Oeiras, of which Estoril Court Central is the most prominent show court. In 2015 the tournament was canceled due to lack of sponsorship. A new tournament, Millennium Estoril Open, was created in its place, moving from Oeiras to Cascais. The 2014 Portugal Open was the last edition.  - The ATP Masters Series was a series of nine tennis tournaments that formed part of the men's Association of Tennis Professionals (ATP) tour, held annually throughout the year in Europe, North America. The tournaments were important for the top male players on the professional circuit as the series constituted the most prestigious tournaments in men's tennis after the four Grand Slam events. The events were known as the Championship Series, Single Week from 1990 to 1995, the Mercedes-Benz Super 9 from 1996 to 1999, the Tennis Masters Series from 2000 to 2004 and the ATP Masters Series until 2008.  - The 2007 Sony Ericsson WTA Tour was the elite professional tennis circuit organized by the Women's Tennis Association (WTA) for the 2007 tennis season. The calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the WTA Tier I-IV Events, the Fed Cup (organized by the ITF) and the year-end championships.  - The 2007 Estoril Open was a tennis tournament played on outdoor clay courts . It was the 18th edition of the Estoril Open , and was part of the International Series of the 2007 ATP Tour , and of the Tier IV Series of the 2007 WTA Tour . Both the men 's and the women 's events took place at the Estoril Court Central in Oeiras , Portugal , from April 30 through May 6 , 2007 .  - A court is a tribunal, often as a government institution, with the authority to adjudicate legal disputes between parties and carry out the administration of justice in civil, criminal, and administrative matters in accordance with the rule of law. In both common law and civil law legal systems, courts are the central means for dispute resolution, and it is generally understood that all persons have an ability to bring their claims before a court. Similarly, the rights of those accused of a crime include the right to present a defense before a court.    After reading the paragraphs above, we are interested in knowing the entity with which '2007 estoril open' exhibits the relationship of 'instance of'. Find the answer from the choices below.  Choices: - administration  - association  - cliff  - court  - criminal  - edition  - event  - federation  - four  - government  - jack  - law  - millennium  - name  - nine  - part  - play  - point  - portugal  - portugal open  - professional  - rights  - season  - september  - series  - show  - single  - strike  - tennis  - tennis court  - tennis tournament  - textile  - tournament  - tribunal  - wta tour  - year
The answer is:
portugal open