CREATE TABLE table_25231 ("Rnd" FLOAT, "Date" CLOB, "Race Name" CLOB, "Length" CLOB, "Track" CLOB, "Location" CLOB, "Pole Position" CLOB, "Winning Driver" CLOB)

In what round did Al Unser win at Wisconsin State Fair Park Speedway?
SELECT MIN("Rnd") FROM table_25231 WHERE "Winning Driver" = 'Al Unser' AND "Track" = 'Wisconsin State Fair Park Speedway'
SELECT MIN("Rnd") FROM "table_25231" WHERE "Track" = 'Wisconsin State Fair Park Speedway' AND "Winning Driver" = 'Al Unser'