user: Question: Which Opponent had a Surface of Hard, and a Partner of Maria Elena Camerin?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '11 November 2006', 'Itajaí , Brazil', 'Clay', 'Teliana Pereira', 'Fernanda Hermenegildo Monika Kochanova', '6–3, 6–3']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Surface" = 'Hard' AND "Partner" = 'Maria Elena Camerin';