CREATE TABLE "singles_wins_5" (
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);

Question: What tournament has Samantha Stosur as the opponent in the final?
SQL: SELECT "tournament" FROM "singles_wins_5" WHERE "opponent_in_the_final"='samantha stosur';

Question: What date is the zürich, switzerland tournament?
SQL: SELECT "date" FROM "singles_wins_5" WHERE "tournament"='zürich, switzerland';

Question: What is the date of the Sydney, Australia tournament with a hard surface?
SQL: SELECT "date" FROM "singles_wins_5" WHERE "surface"='hard' AND "tournament"='sydney, australia';