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_17237 ( "Tournament" text, "Date" text, "City" text, "Country" text, "Surface" text, "Singles champions" text, "Doubles champions" text )

### Question ###
How many doubles champions were there for the Serbia f6 Futures tournament?

### Accurate SQL ###

SELECT COUNT("Doubles champions") FROM table_17237 WHERE "Tournament" = 'Serbia F6 Futures'