Olga Blahotová was the opponent in the final at what tournament?
CREATE TABLE "singles_0_7" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent_in_the_final" text,
  "score" text
);
SELECT "tournament" FROM "singles_0_7" WHERE "opponent_in_the_final"='olga blahotová';