What was the tournament that was on july 6, 1987?
CREATE TABLE "singles_9_6_3" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "tournament" FROM "singles_9_6_3" WHERE "date"='july 6, 1987';