SELECT copa_libertadores_1999 FROM table_name_62 WHERE copa_mercosur_1999 = "group stage" AND team = "vasco"
Apa hasil Copa Libertadores 1999 untuk Team Vasco, yang membuat babak penyisihan grup di Copa Mercosur 1999?
CREATE TABLE table_name_62 (copa_libertadores_1999 VARCHAR, copa_mercosur_1999 VARCHAR, team VARCHAR)