Which Surface has an Outcome of runner-up, and a Score in the final of 4–6, 6–7, 6–2, 2–6?
CREATE TABLE "career_titles_13" (
  "outcome" text,
  "date" real,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);
SELECT "surface" FROM "career_titles_13" WHERE "outcome"='runner-up' AND "score_in_the_final"='4–6, 6–7, 6–2, 2–6';