CREATE TABLE table_42728 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "To par" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

What is the Margin of victory when rhys davies was runner-up?
SELECT "Margin of victory" FROM table_42728 WHERE "Runner(s)-up" = 'rhys davies'
SELECT "Margin of victory" FROM "table_42728" WHERE "Runner(s)-up" = 'rhys davies'