What is the Date of the match with Partner Steffi Graf with a Score in Final of 4–6, 1–6?
CREATE TABLE "doubles_18_7_10" (
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents_in_final" text,
  "score_in_final" text
);
SELECT "date" FROM "doubles_18_7_10" WHERE "score_in_final"='4–6, 1–6' AND "partner"='steffi graf';