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_22673872_1 (rnd INTEGER, winning_driver VARCHAR, track VARCHAR)
### Question:
In what round did Al Unser win at Wisconsin State Fair Park Speedway? 
### Answer:
SELECT MIN(rnd) FROM table_22673872_1 WHERE winning_driver = "Al Unser" AND track = "Wisconsin State Fair Park Speedway"