CREATE TABLE table_58889 ("Circuit" CLOB, "City / State" CLOB, "Date" CLOB, "Winner" CLOB, "Team" CLOB)

What is Winner, when Date is '20 August'?
SELECT "Winner" FROM table_58889 WHERE "Date" = '20 august'
SELECT "Winner" FROM "table_58889" WHERE "Date" = '20 august'