CREATE TABLE table_28138035_27 (mens_singles VARCHAR, year_location VARCHAR)

Who is listed under mens singles when the year location is 2009 doha?
SELECT mens_singles FROM table_28138035_27 WHERE year_location = "2009 Doha"
SELECT "mens_singles" FROM "table_28138035_27" WHERE "2009 Doha" = "year_location"