Club Atlético San Isidro

The first football team of the club, then named "San Isidro A.C." (1902)

A San Isidro squad using their first jersey

At the beginning of 1902, a group of young men started to practise football in a field placed in the lowest part of the hill (called "la barranca" in Spanish). That land was the property of María Varela de Beccar, an aristocratic woman that allowed them to play there. Nevertheless, the frequent swells of the Río de la Plata interrupted the matches many times, causing the boys to stop playing the sport they loved. This circumstance plus the adding of a wide group of football enthusiasts that joined them to play, made the boys to think about founding a club.

The football stadium in 1922

That group of boys was encouraged by some respectable neighbours of the zone, such as Pedro Becco or Manuel Aguirre, and even Avelino Rolón (who was Intendent of San Isidro Partido in 1906). As a result, soon after Aguirre led part of the lands for an indefinite period of time, where "Club de Foot-ball San Isidro" was founded.

By that time (May 1902) a group (formed by English natives and sons of British), most of them employees of the Central Argentine Railway also began to play football in a field next to the railroad station. Those boys founded a club naming it "San Isidro Athletic Club". Soon after that foundation, in the house of Paterson family, Mr. Hudson, McCrindle, Drenan and Ruiz; and Fernando Tiscornia, Manuel Vernet y Pedro Becco (son) as representatives of both clubs, agreed to call to a general assembly with the purpose of merging both clubs into one.

That meeting was celebrated on 24 October 1902, in the "Vignoles hotel" of San Isidro. 33 members of both clubs attended to the meeting, giving their approval to the merge of both clubs, which result was the foundation of "Club Atlético San Isidro".[4]

The squad that won the Tie Cup in 1912

The club registered with the Argentine Football Association to play the Segunda División[5] until 1905 when the team promoted to the top level, Primera División.

San Isidro played all the Primera División championships from 1906[6] to 1931,[7] disaffiliating from AFA when football became professional in Argentina (although the squad remained one season in the amateur league before the two associations merged in 1934). In words from then president of the club, Eduardo Sackmann, "football as a gentlemen and amateur sport, is not for real anymore".[8]

During its football years, San Isidro won one international title, the Tie Cup (played between the Argentine and Uruguayan champions of Copa de Competencia) in 1912, and four domestic cups: three Copa de Competencia and one Copa de Honor. Despite those honours, San Isidro could not win any Primera División championship, being runner-up in 1912, 1913, and 1915.[9][10][11]

Since then, football has been practised at CASI –at amateur level– to present, with senior, youth, children and women squads competing in the tournaments organised by the club.

San Isidro team posing with a puma, mascot of the team in 1918

The first rugby team of San Isidro was formed in 1908, combining British-origin employees of the Central Argentine Railway and a few Argentine-born, but it was dissolved in 1911 without having participated in any competition. Six years later, and due to an initiative by club president Rafael Cullen, San Isidro established a new rugby team, registering with the River Plate Rugby Union that same year. San Isidro won its first title in 1917, setting a record of 13 consecutive championships won (until 1930).[12]

The CASI team that played All Blacks in Buenos Aires, 1985

In 1935 the club held the traditional meeting with the rival team after a match, where no women attended. During the dinner, one of the guests spilled a cup of wine over his pants, which he took off and continued eating. The rest of the players that were sat at the table showed their solidarity with him and also took their pants and continued with the dinner as if nothing had happened.

This was seen by a member of the club who related the incident to club's authorities. As a result, eleven players were suspended by CASI for periods from one to two years. Since the suspension was effective, the team lost the most games played, finishing 6th at the end of the season (Atlético del Rosario was the champion).[13]

At the end of 1935 Julio Urien was elected president of CASI for a new period, therefore the banned players left the club to found their own institution, which they called San Isidro Club (mostly known for its acronym "SIC" within rugby community). Since then, both clubs developed a strong rivalry which has remained to date.[14]

San Isidro has won 33 URBA titles and one Nacional de Clubes to date, becoming the most winning rugby union club of Argentina. Within rugby community, San Isidro is mostly known for its acronym "CASI" instead of full name.

San Isidro was one of the founding members of Argentine Hockey Confederation, along with Belgrano A.C. and Pacific Railway A.C..[15] The women's field hockey team won their first Metropolitano championships in the 1940s. The club inaugurated the first synthetic surface field in 2000. C.A. San Isidro currently has more than 700 players registered.[16]

• The first match played between SIC and CASI was on 9 May 1937, being SIC the winner by 3–0.
• The largest victory over SIC was a 51–7 on 25 August 2013.[20]
• The most important derby played by CASI and SIC was the final of 2005 Torneo de la URBA championship, which CASI won 18–17 with a penalty in the last minutes, after 20 years without an URBA title.
• The largest defeat against SIC was a 55–18 on 28 August 2004.

• Copa de Competencia Jockey Club (3): 1911, 1912, 1913 [33][34][35]
• Copa de Honor Municipalidad de Buenos Aires (1): 1909 [36]
• Tie Cup (1): 1912 [37]

• Nacional de Clubes (1): 1995
• Torneo de la URBA (33): 1917, 1918, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928, 1929, 1930, 1933, 1934,
  1943, 1949, 1954, 1955, 1956, 1957, 1960, 1961, 1962, 1964, 1967, 1974, 1975, 1976, 1981, 1982, 1985, 2005

• Metropolitano Primera División (4): 1908, 1921, 1926, 1948

• Metropolitano Primera División (5): 1943, 1944, 1966, 1967, 1969