CREATE TABLE table_12279 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Which Tournament has a Opponent of piero luisi?
SELECT "Tournament" FROM table_12279 WHERE "Opponent" = 'piero luisi'
SELECT "Tournament" FROM "table_12279" WHERE "Opponent" = 'piero luisi'