What type of surface did they play on 21 July 1997
CREATE TABLE table_62116 (
    "Outcome" text,
    "Date" text,
    "Championship" text,
    "Surface" text,
    "Opponent in the final" text,
    "Score in the final" text
)
SELECT "Surface" FROM table_62116 WHERE "Date" = '21 july 1997'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What type of surface did they play on 21 July 1997 ### Input: CREATE TABLE table_62116 (
    "Outcome" text,
    "Date" text,
    "Championship" text,
    "Surface" text,
    "Opponent in the final" text,
    "Score in the final" text
) ### Response: SELECT "Surface" FROM table_62116 WHERE "Date" = '21 july 1997'