When playing against Yi Jingqian in the final on a hard surface what was the score?
CREATE TABLE "singles_wins_6" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "score" FROM "singles_wins_6" WHERE "surface"='hard' AND "opponent_in_the_final"='yi jingqian';