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_1918850_2 ( surface VARCHAR, championship VARCHAR, score_in_the_final VARCHAR )

### Question ###
state the number of surface where championship is australian open and score in the final is 6 3, 4 6, 11 9

### Accurate SQL ###

SELECT COUNT(surface) FROM table_1918850_2 WHERE championship = "Australian Open" AND score_in_the_final = "6–3, 4–6, 11–9"