CREATE TABLE table_14804 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Name the runner-up for margin of victory of 3 strokes
SELECT "Runner(s)-up" FROM table_14804 WHERE "Margin of victory" = '3 strokes'
SELECT "Runner(s)-up" FROM "table_14804" WHERE "Margin of victory" = '3 strokes'