user: Question: Name the lowest Round with Opponent of Rolando Delgado?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Win', '14-5', 'Henrique Santana', 'TKO (punches)', 'UWC 22', 1.0, '3:47', 'Essex, England , United Kingdom']
SQL:

assistant: SELECT MIN("Round") FROM "Table" WHERE "Opponent" = 'Rolando Delgado';