CREATE TABLE table_54159 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What was the date when Steffi Graf was the opponent in the final and the score was 2 6, 0 6?
SELECT "Date" FROM table_54159 WHERE "Opponent in the final" = 'steffi graf' AND "Score in the final" = '2–6, 0–6'
SELECT "Date" FROM "table_54159" WHERE "Opponent in the final" = 'steffi graf' AND "Score in the final" = '2–6, 0–6'