Major League Soccer
This is highest football (soccer) division in USA, created in 1996 with total 24 clubs in it. 21 of them are USA clubs and 3 Canadians clubs. Clubs are divided in Western and Eastern Conference and play 34 matches for one season. Scheme of matches are unbalanced. Each club play 23 matches with every other member of the division and also 11 matches against club from opposite conference. After this top 6 clubs from each of Conference enters in play-offs to determine which is the champion of the USA. Top 2 teams from each conference are directly qualified for quarter finals in play-offs.