CREATE TABLE table_73915 ("Outcome" TEXT, "No." TEXT, "Date" TEXT, "Championship" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

Marat Safin is the opponent in the final in what championship?
SELECT "Championship" FROM table_73915 WHERE "Opponent in the final" = 'Marat Safin'
SELECT "Championship" FROM "table_73915" WHERE "Opponent in the final" = 'Marat Safin'