CREATE TABLE table_45728 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents in the final" CLOB, "Score in the final" CLOB)

Which Score in the final has a Surface of hard on august 20, 1989?
SELECT "Score in the final" FROM table_45728 WHERE "Surface" = 'hard' AND "Date" = 'august 20, 1989'
SELECT "Score in the final" FROM "table_45728" WHERE "Date" = 'august 20, 1989' AND "Surface" = 'hard'