On what date did the match take place in a round of 1r and have a result 2–6, 5–7, 2–6?
CREATE TABLE "singles_28" (
  "edition" text,
  "round" text,
  "date" text,
  "against" text,
  "surface" text,
  "opponent" text,
  "result" text
);
SELECT "date" FROM "singles_28" WHERE "round"='1r' AND "result"='2–6, 5–7, 2–6';