What was the Surface for the Partner of Jürgen Melzer, and a Date of July 16, 2011?
CREATE TABLE "doubles_8_5_3" (
  "outcome" text,
  "date" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "surface" FROM "doubles_8_5_3" WHERE "partner"='jürgen melzer' AND "date"='july 16, 2011';