Which Opponent in the final has a Partnering of graydon oliver?
CREATE TABLE "runners_up_6" (
  "date" text,
  "tournament" text,
  "surface" text,
  "partnering" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "opponent_in_the_final" FROM "runners_up_6" WHERE "partnering"='graydon oliver';