San Isidro is the national capital of Rugby and home to two of the most important rugby clubs in the country - SIC (San Isidro Club) and CASI (Club Atlético San Isidro).
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On October 1, 1958, the club was officially founded as "Club Manuel Belgrano", being soon accepted by the Union and also supported by other clubs such as Club Atlético San Isidro and Obras Sanitarias.