What is Partner, when Surface is Hard, and when Score is 6–3, 7–6(0)?
CREATE TABLE "doubles_5_2_3" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "partner" FROM "doubles_5_2_3" WHERE "surface"='hard' AND "score"='6–3, 7–6(0)';