CREATE TABLE table_58352 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner-up" TEXT)

who is the runner-up when the winning score is 16 (68-70-65-65=268)?
SELECT "Runner-up" FROM table_58352 WHERE "Winning score" = '−16 (68-70-65-65=268)'
SELECT "Runner-up" FROM "table_58352" WHERE "Winning score" = '−16 (68-70-65-65=268)'