Which Surface has an Opponent of oleksandra kravets?
CREATE TABLE table_name_99 (
    surface VARCHAR,
    opponent VARCHAR
)
SELECT surface FROM table_name_99 WHERE opponent = "oleksandra kravets"
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: Which Surface has an Opponent of oleksandra kravets? ### Input: CREATE TABLE table_name_99 (
    surface VARCHAR,
    opponent VARCHAR
) ### Response: SELECT surface FROM table_name_99 WHERE opponent = "oleksandra kravets"