2012 ATP World Tour
{'<entity_0>': 'Association of Tennis Professionals', '<entity_1>': '2011 ATP World Tour', '<entity_2>': '2012 ATP World Tour', '<entity_3>': '2012', '<entity_4>': 'ATP Tour', '<entity_5>': 'tennis'}
[['2012 ATP World Tour', 'sports season of league or competition', 'ATP Tour'], ['2012 ATP World Tour', 'follows', '2011 ATP World Tour'], ['2012 ATP World Tour', 'organizer', 'Association of Tennis Professionals'], ['2012 ATP World Tour', 'point in time', '2012'], ['2012 ATP World Tour', 'sport', 'tennis']]
The <entity_2> is the global elite professional <entity_5> circuit organized by the <entity_0> (ATP) for the <entity_3> <entity_5> season. The <entity_2> calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the ATP World Tour Masters 1000, the ATP World Tour 500 series, the ATP World Tour 250 series, the ATP World Team Championship, the Davis Cup (organized by the ITF), the ATP World Tour Finals, and the <entity_5> event at the London Summer Olympic Games. These tables present the number of singles (S), doubles (D), and mixed doubles (X) titles won by each player and each nation during the season, within all the tournament categories of the <entity_2>: the Grand Slam tournaments, the <entity_5> event at the London Summer Olympic Games, the ATP World Tour Finals, the ATP World Tour Masters 1000, the ATP World Tour 500 series, and the ATP World Tour 250 series. The following players won their first main circuit title in singles, doubles, or mixed doubles: The following players defended a main circuit title in singles, doubles, or mixed doubles: These are the ATP Rankings of the top twenty singles players, doubles players, and the top ten doubles teams on the <entity_4>, at the end of the <entity_1>, and at the current date of the <entity_3> season. Following is a list of notable players (winners of a main tour title, and/or part of the ATP Rankings top 100 (singles) or top 50 (doubles) for at least one week) who announced their retirement from professional <entity_5>, became inactive (after not playing for more than 52 weeks), or were permanently banned from playing, during the <entity_3> season:
['tennis tour edition']