Who is the Opponent in the final after 1983 with an Outcome of runner-up?
CREATE TABLE "singles_titles_2" (
  "outcome" text,
  "date" real,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);
SELECT "opponent_in_the_final" FROM "singles_titles_2" WHERE "outcome"='runner-up' AND "date">1983;