What is the average round of the match with kevin manderson as the opponent?
CREATE TABLE table_name_18 (round INTEGER, opponent VARCHAR)
SELECT AVG(round) FROM table_name_18 WHERE opponent = "kevin manderson"
### Context: CREATE TABLE table_name_18 (round INTEGER, opponent VARCHAR) ### Question: What is the average round of the match with kevin manderson as the opponent? ### Answer: SELECT AVG(round) FROM table_name_18 WHERE opponent = "kevin manderson"