user: Question: What is the average round against opponent Klas Akesson?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Win', '9-5', 'Eric Davila', 'Submission', 'Art of War - Mano A Mano', 3.0, 'Mesquite, Texas , United States']
SQL:

assistant: SELECT AVG("Round") FROM "Table" WHERE "Opponent" = 'Klas Akesson';