CREATE TABLE "singles_20_8_titles_12_runners_up" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);

Question: What date was gabriela paz-franco the opponent?
SQL: SELECT "date" FROM "singles_20_8_titles_12_runners_up" WHERE "opponent"='gabriela paz-franco';

Question: What surface was the game played on for the September 13, 2009 match?
SQL: SELECT "surface" FROM "singles_20_8_titles_12_runners_up" WHERE "date"='september 13, 2009';