CREATE TABLE table_name_66 (runner_up VARCHAR, champion VARCHAR, year VARCHAR)

Who was the runner-up, when the champion was Bj rn Borg after 1978?
SELECT runner_up FROM table_name_66 WHERE champion = "björn borg" AND year > 1978
SELECT "runner_up" FROM "table_name_66" WHERE "björn borg" = "champion" AND "year" > 1978