CREATE TABLE table_38574 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent" CLOB, "Score" CLOB)

Which Surface has a Tournament of st. petersburg , russia?
SELECT "Surface" FROM table_38574 WHERE "Tournament" = 'st. petersburg , russia'
SELECT "Surface" FROM "table_38574" WHERE "Tournament" = 'st. petersburg , russia'