CREATE TABLE table_68237 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Attendance" FLOAT, "Record" CLOB)

Who was the opponent when the Washington Nationals had a record of 8-4?
SELECT "Opponent" FROM table_68237 WHERE "Record" = '8-4'
SELECT "Opponent" FROM "table_68237" WHERE "Record" = '8-4'