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Lucas Barrios initially played for Argentinos Juniors, a professional football club based in La Paternal, Buenos Aires, Argentina. The club was founded in 1904 and currently plays in the Primera División, the top tier of Argentine football. Barrios played for Argentinos Juniors from 2003 to 2006, scoring 31 goals in 58 appearances. He helped the club win the 2004 Apertura championship and was named the league's top scorer in 2005.