user: Question: Name the opponent for Jul 31 and score of W 5-1
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Crowd', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Jul 1', 'MIN', 'L 0-9', 'Berenguer', '43,484', '55-22']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = 'Jul 31' AND "Score" = 'W 5-1';