Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT surface FROM table_name_57 WHERE round = "4th round" AND player = "maria sharapova"