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_59191 ( "Location" text, "Year" real, "Champion" text, "Runner-up" text, "Score" text )

### Question ###
Who was the runner-up, when the champion was Bj rn Borg after 1978?

### Accurate SQL ###

SELECT "Runner-up" FROM table_59191 WHERE "Champion" = 'björn borg' AND "Year" > '1978'