Who were the runner(s)-up when Tiger won by 11 strokes?
CREATE TABLE "wins_18" (
  "year" real,
  "championship" text,
  "54_holes" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "runner_s_up" FROM "wins_18" WHERE "margin_of_victory"='11 strokes';