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Castro made his professional debut in 2014 when he was substituted for Diego Milito in a 4–0 defeat to Tigre. His second appearance came in a defeat to Atlético de Rafaela, 2 to 0. In spite of having played in no further games in the tournament, he won the national title with La Academia. In the reserve tournament Racing were runners-up to Rosario Central and Castro scored 11 goals in 15 games.