CREATE TABLE table_name_75 (date VARCHAR, surface VARCHAR, score VARCHAR)

Name the date for clay surface and score of 0 6, 0 6
SELECT date FROM table_name_75 WHERE surface = "clay" AND score = "0–6, 0–6"
SELECT "date" FROM "table_name_75" WHERE "0–6, 0–6" = "score" AND "clay" = "surface"