CREATE TABLE table_40104 ("Championship" TEXT, "Current champion ( s ) " TEXT, "Previous champion ( s ) " TEXT, "Date won" TEXT, "Location" TEXT)

Who were the previous champions from the event won on May 1, 2010?
SELECT "Previous champion(s)" FROM table_40104 WHERE "Date won" = 'may 1, 2010'
SELECT "Previous champion(s)" FROM "table_40104" WHERE "Date won" = 'may 1, 2010'