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_30302 ( "Year Location" text, "Mens Singles" text, "Womens Singles" text, "Mens Doubles" text, "Womens Doubles" text )

### Question ###
Who won the mens singles when lau sui fei won the womens singles?

### Accurate SQL ###

SELECT "Mens Singles" FROM table_30302 WHERE "Womens Singles" = 'Lau Sui Fei'