CREATE TABLE table_55826 ("Year" FLOAT, "Championship" TEXT, "54 holes" TEXT, "Winning score" TEXT, "Margin" TEXT, "Runner ( s ) -up" TEXT)

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?
SELECT "Championship" FROM table_55826 WHERE "Margin" = '2 strokes' AND "54 holes" = '1 shot lead' AND "Runner(s)-up" = 'david duval'
SELECT "Championship" FROM "table_55826" WHERE "54 holes" = '1 shot lead' AND "Margin" = '2 strokes' AND "Runner(s)-up" = 'david duval'