What is the Outcome when the partner was kristof vliegen?
CREATE TABLE "doubles_7_2_titles_5_runners_up" (
  "outcome" text,
  "date" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "outcome" FROM "doubles_7_2_titles_5_runners_up" WHERE "partner"='kristof vliegen';