CREATE TABLE table_37612 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

Who's the opponent of the game with the record 64-51?
SELECT "Opponent" FROM table_37612 WHERE "Record" = '64-51'
SELECT "Opponent" FROM "table_37612" WHERE "Record" = '64-51'