Who was Petrova's partner where she scored 6–2, 3–6, 6–7 (7-9)?
CREATE TABLE "doubles_19_9_titles_10_runners_up" (
  "outcome" text,
  "year" real,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "partner" FROM "doubles_19_9_titles_10_runners_up" WHERE "score"='6–2, 3–6, 6–7 (7-9)';