What surface was the tournament played on against Steven Diez?
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"
### Context: CREATE TABLE table_name_96 (surface VARCHAR, opponent_in_the_final VARCHAR) ### Question: What surface was the tournament played on against Steven Diez? ### Answer: SELECT surface FROM table_name_96 WHERE opponent_in_the_final = "steven diez"