What is the championship when the margin was 2 strokes, there were 54 holes with a 1 shot lead, and the runner-up was David Duval?
CREATE TABLE "wins_14" (
  "year" real,
  "championship" text,
  "54_holes" text,
  "winning_score" text,
  "margin" text,
  "runner_s_up" text
);
SELECT "championship" FROM "wins_14" WHERE "margin"='2 strokes' AND "54_holes"='1 shot lead' AND "runner_s_up"='david duval';