Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_20 (win__percentage INTEGER, opposition VARCHAR)
### Question:
What is the lowest win percentage for when Perth Scorchers is the opposition?
### Answer:
SELECT MIN(win__percentage) FROM table_name_20 WHERE opposition = "perth scorchers"