user: Question: Which opponent has a record of 3–1?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '4–2', 'Matt Mitrione', 'TKO (punches)', 'UFC 113', 2.0, '4:24', 'Montreal, Quebec , Canada']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Record" = '3–1';