CREATE TABLE "singles" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);

Question: Which tournament had Lubomira Bacheva as the opponent in the final?
SQL: SELECT "tournament" FROM "singles" WHERE "opponent_in_the_final"='lubomira bacheva';

Question: Who was the opponent in the final on 5 July 1992?
SQL: SELECT "opponent_in_the_final" FROM "singles" WHERE "date"='5 july 1992';

Question: What is the date of the tournament where Kyoko Nagatsuka was the opponent in the final?
SQL: SELECT "date" FROM "singles" WHERE "opponent_in_the_final"='kyoko nagatsuka';

Question: What is the surface at the tournament of Vaihingen?
SQL: SELECT "surface" FROM "singles" WHERE "tournament"='vaihingen';

Question: What was the surface of the tournament where Anna Benzon was the opponent in the final?
SQL: SELECT "surface" FROM "singles" WHERE "opponent_in_the_final"='anna benzon';