Juan Doyle Vaca Mendoza (born 8 October 1979 in Santa Cruz de la Sierra) is a Bolivian retired football defender.
Vaca made his debut for the Bolivia national team on October 7, 2001, in a World Cup qualifying match against Ecuador, as a 32nd-minute substitute for Sergio Rogelio Castillo.
Since then he has scored once for the national squad.
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