CREATE TABLE table_7850 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

Who was the runner-up with the margin of victory of 8 strokes?
SELECT "Runner(s)-up" FROM table_7850 WHERE "Margin of victory" = '8 strokes'
SELECT "Runner(s)-up" FROM "table_7850" WHERE "Margin of victory" = '8 strokes'