On 17 January 1920, the home teams went undefeated in all 20 matches in England's Football League, as well as the day's two FA Cup games.
At the time, the Football League consisted of only two divisions (though a separate Southern League existed, with two divisions of of its own). While each division consisted of 22 teams, two games were not played, so there were only 20 games total across both divisions.
The results in Division One consisted of eight wins and two draws, including 21st-place Oldham Athletic's 1-0 upset victory of second-place Newcastle. The largest margins were Manchester City's 4-1 win over Arsenal and league-leader West Brom's 5-2 win over Blackburn.
In Division Two, there were nine wins and only one draw, a 1-1 result between Bury and Nottingham Forest, while Lincoln City's 4-0 win over Wolves set the day's largest margin of victory.
There were also two first-round FA Cup matches played that day, with Bradford City beating Portsmouth 2-0 and West Stanley beating Gillingham 3-1.