CREATE TABLE table_8291 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

When was the outcome runner-up with a score of 4 6, 3 6?
SELECT "Date" FROM table_8291 WHERE "Outcome" = 'runner-up' AND "Score" = '4–6, 3–6'
SELECT "Date" FROM "table_8291" WHERE "Outcome" = 'runner-up' AND "Score" = '4–6, 3–6'