CREATE TABLE table_5778 ("Outcome" CLOB, "Date" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponent in the final" CLOB, "Score in the final" CLOB)

Which Surface has a Partner of oliver marach?
SELECT "Surface" FROM table_5778 WHERE "Partner" = 'oliver marach'
SELECT "Surface" FROM "table_5778" WHERE "Partner" = 'oliver marach'