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

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'