The referees for the 2010 Copa Libertadores Finals are Héctor Baldassi of Argentina and Óscar Ruiz of Colombia. Baldassi's 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 2007 FIFA U-20 World Cup, but was later dismissed because one of his assistants didn't pass the medical tests. He also refereed for the 2010 FIFA World Cup. Ruiz has been a referee since 1 January 1995, and his international debut was on 12 July 1995 (Paraguay vs. Venezuela). He officiated in the 2002 and 2006 FIFA World Cups. He was preselected as a referee for the 2010 FIFA World Cup. He is a lawyer by profession.