CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "record" text,
  "game_site" text,
  "attendance" real
);

Question: Who was the opponent at the game at Sullivan Stadium before week 11?
SQL: SELECT "opponent" FROM "schedule" WHERE "week"<11 AND "game_site"='sullivan stadium';