CREATE TABLE table_59331 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent" CLOB, "Score" CLOB)

What is Surface, when Opponent is 'Ji Van k'?
SELECT "Surface" FROM table_59331 WHERE "Opponent" = 'jiří vaněk'
SELECT "Surface" FROM "table_59331" WHERE "Opponent" = 'jiří vaněk'