Table schema:
CREATE TABLE table_name_15 (outcome VARCHAR, score_in_the_final VARCHAR, date VARCHAR)

Question: Name the Outcome which has a Score in the final of 4–6, 4–6 on october 21, 1990?
SQL: SELECT outcome FROM table_name_15 WHERE score_in_the_final = "4–6, 4–6" AND date = "october 21, 1990"