CREATE TABLE table_72643 ("Year" FLOAT, "Championship" CLOB, "54 holes" CLOB, "Winning score" CLOB, "Margin" CLOB, "Runner-up" CLOB)

WHAT WAS THE YEAR WHEN THE RUNNER-UP WAS WILLIAM MEHLHORN?
SELECT MAX("Year") FROM table_72643 WHERE "Runner-up" = 'William Mehlhorn'
SELECT MAX("Year") FROM "table_72643" WHERE "Runner-up" = 'William Mehlhorn'