CREATE TABLE table_71209 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Attendance" FLOAT, "Record" CLOB)

Who was the opponent on May 20?
SELECT "Opponent" FROM table_71209 WHERE "Date" = 'may 20'
SELECT "Opponent" FROM "table_71209" WHERE "Date" = 'may 20'