user: Question: Can you tell me the Opponent that has the Series of 4-2?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Series']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['October 17', '@ Braves', '3 - 1', 'Morris (0-1)', 51763.0, '0-1']
SQL:

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