#5 vs Spartak Moscow (Group stage)
The two games against Spartak Moscow showed the best and worst sides of Liverpool's attack. They can either be frighteningly good, which they usually are, but they also can be frustratingly wasteful. All of the Fab Four, at the time, played both matches.
Moscow saw Liverpool waste a whole lot of chances to win the game, including a tasty four-on-one counter-attacking situation at the end of the first half. This game came in the middle of a pretty dire spell for Liverpool which was filled withdraws, and this one was no different. There were many chances created, but only one was taken. This was another small stumble as the Reds drew 1-1 in Russia.
Fast forward to two months later and Liverpool thrashed them 7-0. Phillipe Coutinho ran the show with a hat-trick, while Mane, Firmino and Salah all grabbed goals. This Liverpool scared the Spartak defence silly and ran riot, looking dangerous during every attack. A completely different outcome from what happened in October, in every way imaginable.
Funnily, this was not Liverpool's first 7-0 victory of the campaign.