This game was Liverpool's most important game of the season by a mile and the players did not disappoint. Yes, The Reds looked shaky at the back but the attackers have finally decided they want to turn up and what a time to.
This is only Liverpool's second win at Old Trafford since 2010, and what a big one it could be. Liverpool are now in full control of getting Champions League football if they win their remaining three games. So, let's take a look at five things we learned from the crucial win at Old Trafford.
1) Trent Alexander-Arnold is the best RB in Europe
Trent Alexander-Arnold had a bit of a bad run of form at the beginning of the season but since he got dropped by Gareth Southgate from the England squad he has been back to his very best. Trent had his best performance of the season and was by far the best player on the pitch.
A performance from the young man that will go down in the history books if Liverpool get Champions League football next season. Trent was exceptional today, he assisted Roberto Firmino's first goal with an amazing cross and was impactful in Firmino's second goal, too. The 22 year-old also created five chances which is absolutely crazy. Alexander-Arnold is back to his best and it's came at the best time possible for Liverpool.
2) Champions League Qualification Is In The Reds' Hands
Tonight's win is huge in Liverpool's push for top four this season. With Chelsea and Leicester still having to play each other, it means when one or both of them drops points against each other, Liverpool will be in the driver's seat.
If Leicester lose to Chelsea and Liverpool win their remaining three games against West Brom, Burnley and Crystal Palace, Jurgen Klopp and his squad will be playing in the Champions League next season. Liverpool are just hoping Brendan Rodger's Leicester either drop points against Tottenham or don't win by a huge amount of goals as it will go down to goal difference if they beat Spurs.
3) Thiago & Fabinho need to start in midfield every week
We've known this for quite some time now but it looks like Jurgen Klopp has finally figured it out too. Fabinho and Thiago Alcantara complement each other so well in midfield and not utilising them both in the centre of the field together is a reason The Reds have been losing a lot of the midfield battles this season.
Today proved it even more, Liverpool may be more vulnerable at the back but the quality is undeniable when they play together. For large parts of the game Fabinho and Thiago just pinned United in their own half and it was amazing to watch. The final piece of the midfield puzzle is currently injured but when Jordan Henderson is back to full fitness, this midfield is going to be one of the best in Europe once again.
4) Mohamed Salah Needs To Be Liverpool Captain
The absolute passion Mohamed Salah showed after scoring the fourth goal to seal this important win was everything Liverpool need in a captain in these final games. Georginio Wijnaldum's head is clearly somewhere else and for the majority of this season he has been very poor and today was no different.
Salah has shown how much this club means to him and when James Milner or Henderson aren't able to play it shouldn't even be a question that Mohamed Salah should have the armband over Gini. Hopefully today proved that to Jurgen Klopp as he can see how much Salah adores Liverpool FC. He has been The Reds' best player this season and deserves to be the one who leads us to the Champions League
5) Liverpool Need To Outscore Their Opponents The Rest of The Season
It's looking more likely that we're going to have to convert back to pre Virgil van Dijk Liverpool. With Thiago and Fabinho being so important in midfield, it's going to be either Nathaniel Phillips and Ozan Kabak or Rhys Williams, and let's be honest neither of them are top class Premier League defenders.
Luckily Liverpool look like they're scoring again, so for these final three games Klopp and the players might have to revert to 'rock and roll football' like they did before Big Virg joined. It will be nothing but entertaining, but as most Liverpool fans remember, it is not good for your heart rate when Liverpool play like that.