What date was the Izmir Cup in which İlhan played against Somdev Devvarman?
CREATE TABLE "singles_2_8" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "date" FROM "singles_2_8" WHERE "tournament"='izmir cup' AND "opponent"='somdev devvarman';