CREATE TABLE table_50866 ("Tournament" TEXT, "Surface" TEXT, "Week" TEXT, "Winner" TEXT, "Finalist" TEXT, "Semifinalists" TEXT)

WHich Tournament has a Finalist of marat safin (12)?
SELECT "Tournament" FROM table_50866 WHERE "Finalist" = 'marat safin (12)'
SELECT "Tournament" FROM "table_50866" WHERE "Finalist" = 'marat safin (12)'