ฝ่ายตรงข้ามคนใดมีพื้นผิวแข็งและเป็นคู่หูของ Maria elena camerin?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
Which Opponent had a Surface of hard, and a Partner of maria elena camerin?It is not neccessary to use all the tables.
 table_6703:  "Outcome" [ text]  "Date" [ text]  "Tournament" [ text]  "Surface" [ text]  "Partner" [ text]  "Opponent" [ text]  "Score" [ text] 
SELECT "Opponent" FROM table_6703 WHERE "Surface" = 'hard' AND "Partner" = 'maria elena camerin'