Who was the Opponent partnering with Jordan Kerr, on a hard surface that was the winner?
CREATE TABLE "doubles_37_17_20" (
  "outcome" text,
  "date" text,
  "surface" text,
  "partnering" text,
  "opponent" text,
  "score" text
);
SELECT "opponent" FROM "doubles_37_17_20" WHERE "surface"='hard' AND "outcome"='winner' AND "partnering"='jordan kerr';