Manchester City faced a must-win match against a league-leading side not too long ago.
Not two weeks later, the thought that Arsenal could run and hide from anyone is a joke.
City thrashed the North London side 6-3, and as the Boxing Day matches begin, Arsenal have lost their league lead on goal difference to "welcome back to relevance" Liverpool.
So here are City again, faced with another match in the friendly confines of the Etihad Stadium against a real title threat, saddled with the responsibility of keeping a contender honest.
Here are five tactical battles that will shape City's clash with Liverpool.