Which Tournament has a Opponent of piero luisi?
CREATE TABLE table_name_31 (tournament VARCHAR, opponent VARCHAR)
SELECT tournament FROM table_name_31 WHERE opponent = "piero luisi"
### Context: CREATE TABLE table_name_31 (tournament VARCHAR, opponent VARCHAR) ### Question: Which Tournament has a Opponent of piero luisi? ### Answer: SELECT tournament FROM table_name_31 WHERE opponent = "piero luisi"