user: Question: Which opponent has an attendance of 17,015?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['September 2', 'Athletics', '5 - 2', 'Gonzalez (1-3)', '11,143', '58-79']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Attendance" = '17,015';