CREATE TABLE table_58982 ("Outcome" TEXT, "Date" TEXT, "Championship" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What Opponent in the final has a Date of 19 september 1988?
SELECT "Opponent in the final" FROM table_58982 WHERE "Date" = '19 september 1988'
SELECT "Opponent in the final" FROM "table_58982" WHERE "Date" = '19 september 1988'