user: Question: Which opponent has a record of 4-2?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Win', '20-6', 'Donald Cerrone', 'Decision (unanimous)', 'UFC Fight Night: Condit vs. Kampmann 2', '3', '5:00', 'Indianapolis, Indiana , United States']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Record" = '4-2';