user: Question: Who was the opponent on September 28?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Save']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 1', '@ Phillies', '13–9', 'Mesa (5–7)', '||61,068||79–58']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = 'September 28';