CREATE TABLE table_40758 ("Date" CLOB, "Event" CLOB, "Winner" CLOB, "Team" CLOB, "Series leader" CLOB)

What is the Series leader with a Date that is may 31?
SELECT "Series leader" FROM table_40758 WHERE "Date" = 'may 31'
SELECT "Series leader" FROM "table_40758" WHERE "Date" = 'may 31'