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_8278 ( "Tournament" text, "Surface" text, "Week" text, "Winner and score" text, "Finalist" text, "Semifinalists" text )

### Question ###
Who are the semifinalists of the tournament with magnus gustafsson as the finalist?

### Accurate SQL ###

SELECT "Semifinalists" FROM table_8278 WHERE "Finalist" = 'magnus gustafsson'