CREATE TABLE table_57919 ("Edition" CLOB, "Round" CLOB, "Date" CLOB, "Against" CLOB, "Surface" CLOB, "Opponent" CLOB, "Result" CLOB)

What's Round has a Surface of hard and Opponent of Jelena Simic?
SELECT "Round" FROM table_57919 WHERE "Surface" = 'hard' AND "Opponent" = 'jelena simic'
SELECT "Round" FROM "table_57919" WHERE "Opponent" = 'jelena simic' AND "Surface" = 'hard'