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Football is the most popular sport, both in terms of participants and spectators, in the Argentine capital of Buenos Aires. Buenos Aires has one of the highest concentration of football teams of any city in the world (featuring at least 18 professional football teams), with many of its teams playing in the top tier Primera División. This has led to the development of several rivalries within the city, contested as "derbys" when the regular league schedule brings these teams together, such as the Superclásico between Boca Juniors and River Plate – deemed one of the "50 sporting things you must do before you die" by The Observer.[1] Other major clubs include Vélez Sarsfield, Ferro Carril Oeste and Argentinos Juniors.