CREATE TABLE table_name_73 (opponent VARCHAR2, outcome VARCHAR2, surface VARCHAR2)

Who did Thomaz Bellucci play against when he became runner-up on a clay surface?
SELECT opponent FROM table_name_73 WHERE outcome = "runner-up" AND surface = "clay"
SELECT "opponent" FROM "table_name_73" WHERE "clay" = "surface" AND "outcome" = "runner-up"