Which Partner has a Tournament of catella swedish open?
CREATE TABLE "doubles_9_6_titles_3_runner_ups" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "partner" FROM "doubles_9_6_titles_3_runner_ups" WHERE "tournament"='catella swedish open';