What date was the 1988 world group i edition with a result of 7–6 (7–5) , 6–3?
CREATE TABLE "singles_5_6" (
  "edition" text,
  "round" text,
  "date" text,
  "surface" text,
  "opponent" text,
  "result" text
);
SELECT "date" FROM "singles_5_6" WHERE "edition"='1988 world group i' AND "result"='7–6 (7–5) , 6–3';