user: Question: What is the average number of rounds for winner Rafael Cavalcante?
Columns: ['Weight Division', 'Winner', 'Loser', 'Method', 'Round', 'Time']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Light Heavyweight', 'Rafael Cavalcante', 'John Doyle', 'TKO (Knee)', 1.0, '2:17']
SQL:

assistant: SELECT AVG("Round") FROM "Table" WHERE "Winner" = 'Rafael Cavalcante';