CREATE TABLE table_16888 ("Year" FLOAT, "Championship" TEXT, "54 holes" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Who were the runner(s)-up when Tiger won by 11 strokes?
SELECT "Runner(s)-up" FROM table_16888 WHERE "Margin of victory" = '11 strokes'
SELECT "Runner(s)-up" FROM "table_16888" WHERE "Margin of victory" = '11 strokes'