Table schema:
CREATE TABLE table_name_98 (date VARCHAR, score_in_the_final VARCHAR, opponents_in_the_final VARCHAR)

Question: What is the date of the final that has a score of 3–6, 6–3, 6–4 and penny barg paula smith was the opponent?
SQL: SELECT date FROM table_name_98 WHERE score_in_the_final = "3–6, 6–3, 6–4" AND opponents_in_the_final = "penny barg paula smith"