CREATE TABLE table_name_40 (previous_champion_s_ VARCHAR, date_won VARCHAR)

Who were the previous champions from the event won on May 1, 2010?
SELECT previous_champion_s_ FROM table_name_40 WHERE date_won = "may 1, 2010"
SELECT "previous_champion_s_" FROM "table_name_40" WHERE "date_won" = "may 1, 2010"