CREATE TABLE "singles_5_4_titles_1_runner_up" (
  "outcome" text,
  "date" text,
  "surface" text,
  "opponent" text,
  "score" text
);

Question: What is the score when Li Na was the opponent?
SQL: SELECT "score" FROM "singles_5_4_titles_1_runner_up" WHERE "opponent"='li na';

Question: Who was the opponent on 19 February 2011?
SQL: SELECT "opponent" FROM "singles_5_4_titles_1_runner_up" WHERE "date"='19 february 2011';