Context : Alfredo Amézaga Delgado (/əˈmɛzəɡə/; Spanish pronunciation: (alˈfɾeðo aˈmesaɣa); born January 16, 1978 in Ciudad Obregón, Sonora, Mexico) is a professional baseball player, who is currently with the Tigres de Quintana Roo of the Mexican League. 
Answer : Sonora
In what city was Alfredo Amézaga born?