 Complete the following phrase:  The referees for the 2010 Copa Libertadores Finals are Héctor Baldassi of Argentina and Óscar Ruiz of Colombia. Baldassis first officiated in the Argentine Primera División in 1998 and two years later he debuted internationally. He has officiated several CONMEBOL club competitions including the final match of the 2008 Copa Libertadores, and participated in several international competitions including the 2004 Copa América and the 2008 Olympic Games in Beijing. He was called for the 