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_28181401_4 (round VARCHAR, scorers VARCHAR)

### Question ###
when roberts 86' is the scorer what is the round?

### Accurate SQL ###

SELECT round FROM table_28181401_4 WHERE scorers = "Roberts 86'"