#3 A tale of two goalkeepers
If keen followers of the game were asked to name their choices for three best goalkeepers in the world, it is highly likely that an overwhelming majority would have both Alisson Becker and Jan Oblak on their lists.
The two men have been nothing short of stellar in the last few years, with the Brazilian serving as the missing piece of Jurgen Klopp's puzzle at Anfield, while Oblak has been sublime between the sticks for Atletico Marid.
A calf injury ruled Alisson out of this clash and Adrian took his place between in goal and the former West Ham man showed the difference in quality, making a schoolboy error to hand the initiative to the visitors.
Whereas Oblak's 12 saves on the night proved to be the difference between qualification and elimination for Atletico Madrid, his opposite number highlighted why the need for a reliable goalkeeper can never be underestimated no matter how balanced the rest of the team is.