user: Question: Who was the opponent when the series was at 1-3?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Series']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['October 8', '@ Twins', '5 - 4', 'Candiotti (0-1)', 54766.0, '0-1']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Series" = '1-3';