user: Question: What is the average number of rounds when fighting against Clay Guida?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '16–9', 'Josh Thomson', 'TKO (head kick and punches)', 'UFC on Fox: Henderson vs. Melendez', 2.0, '3:44', 'San Jose, California , United States']
SQL:

assistant: SELECT AVG("Round") FROM "Table" WHERE "Opponent" = 'Clay Guida';