CREATE TABLE table_name_96 (surface VARCHAR, opponent_in_the_final VARCHAR)
SELECT surface FROM table_name_96 WHERE opponent_in_the_final = "steven diez"
ทัวร์นาเมนต์นี้เล่นกับสตีเวน ดิเอซบนพื้นผิวใด?
What surface was the tournament played on against Steven Diez?