CREATE TABLE table_67703 ("Outcome" TEXT, "Date" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What was the surface on 23 October 2011?
SELECT "Surface" FROM table_67703 WHERE "Date" = '23 october 2011'
SELECT "Surface" FROM "table_67703" WHERE "Date" = '23 october 2011'