What round had a result of 6–7 (6–8) , 1–6?
CREATE TABLE "singles_5_6" (
  "edition" text,
  "round" text,
  "date" text,
  "surface" text,
  "opponent" text,
  "result" text
);
SELECT "round" FROM "singles_5_6" WHERE "result"='6–7 (6–8) , 1–6';