user: Question: How many rounds was the fight against Carter Williams?
Columns: ['Result', 'Opponent', 'Method', 'Event', 'Round', 'Location']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['No contest', 'Dževad Poturak', 'No contest (punch after knockdown)', 'Elite Kickboxing', 1.0, 'Las Vegas, Nevada, USA']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Opponent" = 'Carter Williams';