What was the championship that had final score of 6–2, 5–7, 6–4, 6–2 and was on a clay surface?
CREATE TABLE "singles_finals_16_9_7" (
  "outcome" text,
  "date" real,
  "championship" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score_in_the_final" text
);
SELECT "championship" FROM "singles_finals_16_9_7" WHERE "surface"='clay' AND "score_in_the_final"='6–2, 5–7, 6–4, 6–2';