Detroit Lions take the belt

Detroit Lions beat Chicago Cardinals 16–7 at home to start reign 52 of the NFL belt, the 2nd for the franchise.

Chicago Cardinals had held it since September 12, 1937, with 0 defenses over 7 days.

Detroit Lions held it for 14 days and 0 defenses, then lost it to Green Bay Packers on October 3, 1937.