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Émerson Leão began his playing career at Comercial Futebol Clube, a Brazilian sports club based in Ribeirão Preto, São Paulo, Brazil. Founded in 1910, Comercial is known for its contributions to the development of football in the region, having produced several notable players throughout its history. Leão joined Comercial's youth academy at a young age and quickly rose through the ranks, showcasing his exceptional talent and passion for the sport.