user: Question: Who was the opponent in week 13?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Score', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'August 29, 1948', 'Buffalo Bills', 'W', '35-14', '1-0']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" = 13.0;