CREATE TABLE table_23235767_4 (championship VARCHAR2, surface VARCHAR2, opponent_in_the_final VARCHAR2)

Name the championship for clay and corrado barazzutti
SELECT championship FROM table_23235767_4 WHERE surface = "Clay" AND opponent_in_the_final = "Corrado Barazzutti"
SELECT "championship" FROM "table_23235767_4" WHERE "Clay" = "surface" AND "Corrado Barazzutti" = "opponent_in_the_final"