CREATE TABLE table_203_506 (id NUMBER, "opponent" CLOB, "played" NUMBER, "won" NUMBER, "lost" NUMBER, "drawn" NUMBER, "% won overall" CLOB)

name the only team they had a losing record against .
SELECT "opponent" FROM table_203_506 ORDER BY "lost" DESC LIMIT 1
SELECT "opponent" FROM "table_203_506" ORDER BY "lost" DESC FETCH FIRST 1 ROWS ONLY