user: Question: Who was the opponent on May 20?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['May 1', 'Angels', '7 - 2', 'Drese (2-3)', '23,536', '13-14']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = 'May 20';