CREATE TABLE "singles_21_5" (
  "edition" text,
  "round" text,
  "date" text,
  "surface" text,
  "opponent" text,
  "result" text
);

Question: What opponent has a result of 3–6, 6–2, 4–6?
SQL: SELECT "opponent" FROM "singles_21_5" WHERE "result"='3–6, 6–2, 4–6';

Question: When was the 1991 world group I with the opponent of Li Fang?
SQL: SELECT "date" FROM "singles_21_5" WHERE "edition"='1991 world group i' AND "opponent"='li fang';

Question: On July 15, 1984 what surface was used?
SQL: SELECT "surface" FROM "singles_21_5" WHERE "date"='july 15, 1984';

Question: For what round was the opponent mercedes paz with a result of 4–6, 6–1, 6–3?
SQL: SELECT "round" FROM "singles_21_5" WHERE "opponent"='mercedes paz' AND "result"='4–6, 6–1, 6–3';

Question: What surface was used on July 17, 1983?
SQL: SELECT "surface" FROM "singles_21_5" WHERE "date"='july 17, 1983';

Question: What was the result on October 8, 1985?
SQL: SELECT "result" FROM "singles_21_5" WHERE "date"='october 8, 1985';