CREATE TABLE table_64724 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Who was the opponent on May 10, 2009?
SELECT "Opponent" FROM table_64724 WHERE "Date" = 'may 10, 2009'
SELECT "Opponent" FROM "table_64724" WHERE "Date" = 'may 10, 2009'