Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
who is the opponent when the streak is won 9 on april 13, 1990?

### Inputs:
table_name: table, columns: ['Date', 'Opponent', 'Score', 'Record', 'Streak']

### Response:
SELECT Opponent FROM table WHERE Streak = won 9 AND Date = april 13, 1990