Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_57 (surface VARCHAR, round VARCHAR, player VARCHAR)
### Question:
Which Surface has a Round of 4th round, and a Player of maria sharapova?
### Answer:
SELECT surface FROM table_name_57 WHERE round = "4th round" AND player = "maria sharapova"