Manchester City face Manchester United on Monday in what is being billed as the biggest derby game of all time.
As well as the usual bragging rights and battle for city supremacy that come with the fixture is the small matter of deciding the Premier League title.
A win for United will put them six-points clear at the top of the league. A win for City takes them top on goal difference. Both sides will still have two further fixtures to negotiate but it would appear this is where the league title will be decided.
In light of this mammoth contest, we take a look at some other season defining games - where two teams came together to not only battle for a stand alone victory, but in a game which would define both teams' seasons.
Click here or click 'VIEW GALLERY' to launch our guide.