Manchester City will need to overturn a three-goal deficit on Tuesday night if they are to stun Liverpool and advance to the Champions League semi-finals.
Pep Guardiola's team were blown away by Jurgen Klopp's side in last week's first leg, conceding three goals in a devastating 19-minute spell in the first-half at Anfield.
The good news for City is that there is historical precedent for achieving such a comeback in the Champions League. However, it hasn't happened too often.
Just once has a team overturned a four-goal deficit - Barcelona's famous win over Paris Saint-Germain last season - while only one other team has managed to come back from a three-goal loss.