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_28138035_27 ( mens_singles VARCHAR, year_location VARCHAR )

### Question ###
Who is listed under mens singles when the year location is 2009 doha?

### Accurate SQL ###

SELECT mens_singles FROM table_28138035_27 WHERE year_location = "2009 Doha"