CREATE TABLE table_71517 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner-up" TEXT)

Which runner-up has a 10 strokes margin of victory?
SELECT "Runner-up" FROM table_71517 WHERE "Margin of victory" = '10 strokes'
SELECT "Runner-up" FROM "table_71517" WHERE "Margin of victory" = '10 strokes'