Martín Carlos Alarcón, in Brazil often just Alarcón, born 25 December 1928 in Formosa, Argentina, was an association football player. It is reported, that the short, skillful and very speedy attacker commenced his career in 1945 at the lowly Club Sportivo Patria in his hometown. Several years later the Paraguayan national team coach Manuel Fleitas Solich helped him to get contracted with Club Libertad in the capital Asunción. In 1951, he returned to Argentina to play for the top club CA River Plate in Buenos Aires, where he had little success competing with players like Angel Labruna, Felix Loustau and Walter Gomez for an attacker position. Thus, in 1952 he took the opportunity to play again for Libertad. After competing without much success in the Copa Rio of 1952 Libertad went on to become runner-up in the national championship. In 1953 Libertad became again runner up in the championship, and players from the club made up the majority of the Paraguayan national team that in the same year won for the first time the South American Championship. In 1954, Martín Alarcón moved to Brazil, where he joined America FC in Rio de Janeiro, coached by Martim Francisco, who is credited with introducing the 4-2-4-system in Brazil. Alongside players like Canário, who would later transfer to Real Madrid, and Manoel Pereira – known as Leônidas da Selva, or "Jungle Leônidas", due to his "raw" skills and resemblance to Leônidas da Silva –, Alarcón was 1954 and 1955 Championship of Rio de Janeiro runner-up, on both occasions losing the title to CR Flamengo. In a best-of-three series for the 1955 title, America lost the first match to Flamengo 0–1 and won the second one 5–1. In the decisive match on 6 April 1956 at Maracanã Stadium, before almost 140,000 spectators, a record crowd for America, Alarcón had to leave the field early in the first half after a tackle by Flamengo defender Tomires. Substitutions were not allowed then and the balance of the match swung to Flamengo, coached by Fleitas Solich, who eventually won 4–1 thus attaining its third consecutive title. Alarcón, who is sometimes considered the top player of this era of America FC, had two more good years with the club in 1956 and 1957, in the latter year scoring 14 goals in the Rio-Championship, his highest tally ever. However, America had to make do with the 5th and 6th places. From mid-1958 forward Alarcón only received little if any playing time. Eventually, early 1960, the year when America would win its seventh and hitherto last Rio-Championship, Alarcón left the club. In January 1960 he joined CD Los Millonarios in the Colombian capital Bogotá. With the club he won under the legendary coach Gabriel Ochoa Uribe the championships on 1961 and 1962.