user: Question: What's Round has a Surface of Hard and Opponent of Jelena Simic?
Columns: ['Edition', 'Round', 'Date', 'Against', 'Surface', 'Opponent', 'Result']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2009 Fed Cup Europe/Africa Group II', 'RR', '22–24 April 2009', 'Morocco', 'Hard', 'Fatima El Allami', '6–4, 7–5']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Surface" = 'Hard' AND "Opponent" = 'Jelena Simic';