Alexander-Arnold, seeing the Spanish club's defenders still getting organised, feigned to walk away from the corner before racing back to whip the ball to the unmarked Divock Origi, who clipped it past Marc-Andre ter Stegen.
Images from the UEFA Champions League matches played on Tuesday
Liverpool opened up an eight-point lead at the top of the Premier League with an emphatic and hugely impressive 3-1 win over defending champions Manchester City.
Liverpool's bandwagon rolled on as they crushed Merseyside rivals Everton 5-2
Liverpool feel they beat any team in the world at the moment and will play without fear in the Champions League final against 12-times winners Real Madrid later this month, winger Sadio Mane has said.
IMAGES from the English Premier League match played between Manchester United and Liverpool at Old Trafford on Saturday
Mohamed Salah is ready to feature in Liverpool's Premier League title decider against Wolverhampton Wanderers on Sunday after the Egyptian forward recovered from concussion.
Liverpool have extended captain Jordan Henderson's contract, the Premier League side said on Tuesday, putting an end to speculation over his future at the Merseyside club.
Jose Mourinho's United side have 62 points and lead the Merseyside club by two with nine game remaining.
Runaway Premier League leaders Manchester City will play Borussia Dortmund with the winners to face either Bayern or PSG in the semi-finals.
Liverpool analysts had watched how Barcelona players were always distracted when decisions went against them and word was passed down to Carl Lancaster, a coaching mentor at the club's academy, who asked the ball boys to serve their players quickly.
Brazilian Richarlison missed a golden opening to win it at the death and Spurs had to settle for one point in a match they really should have taken all three from.
Liverpool manager Juergen Klopp is expecting his toughest test yet in a Merseyside derby when his side face local rivals Everton in the Premier League on Sunday.
Liverpool's Mohamed Salah ended his Premier League goal drought in style by scoring twice as the champions raided the capital again to crush West Ham United 3-1 on Sunday.
Manchester City have one just victory from their last 10 games across all competitions.
It promises to be a tense and thrilling finale to the season but Liverpool, who have frittered away a seven-point lead, will need to regain their momentum quickly if they are to push for their first league title since 1990.
Liverpool took a giant step towards their first title since 1990 on Saturday when their 3-0 win at Bournemouth combined with Manchester United's 2-1 victory at Manchester City to leave the champions 14 points adrift of the Premier League leaders.
Images from the English Premier League matches played on Saturday.
Tottenham Hotspur and Liverpool fans' joy at reaching the Champions League final has been dampened by the eye-watering costs of travelling to Madrid for the June 1 showdown.
The lack of a winter break in English football took its toll on Liverpool players' fitness levels and played a part in the Merseyside club's poor form since the start of the year, manager Juergen Klopp has said.
Images from English Premier League matches played on Sunday.
'Porto are a really, really good football team. We have to play at our limit 100 percent'
Liverpool boss Juergen Klopp has said his team will be 'on fire' for the Champions League final
Liverpool's James Milner's converted a penalty on the stroke of half-time and Sadio Mane added a late second goal to secure a hard-fought 2-0 victory at Crystal Palace in the Premier League on Monday.
The pain of missing out on a first domestic league crown for 29 years will be eased by the knowledge that European glory could be on the horizon for Liverpool
A round-up of Saturday's matches in the English Premier League.
English Premier League champions Manchester City beat FA Cup winners Manchester United 7-6 on penalties to win the Community Shield.
Liverpool's 1-1 draw at Everton could not save manager Brendan Rodgers from the sack.
Manchester City forward Raheem Sterling struck twice as the Premier League champions beat Crystal Palace 3-1 at Selhurst Park on Sunday to go top of the table and heap pressure on title rivals Liverpool.
Images from the English Premier League matches played on Saturday.
Daniel Sturridge's Liverpool career seemed to be heading for a premature end last season but the striker showed on Tuesday he may yet have an important role after taking his chance during a rare start in the Champions League win over Paris St Germain.
Five-time European champions Liverpool are in the quarter-finals of this year's competition
Liverpool ripped apart Manchester City with three goals inside the opening 31 minutes as they won their Champions League quarter-final, first leg tie 3-0 on Wednesday.
'That is how it is. How we created the moments was outstanding, how we caused them problems was outstanding, we controlled the game so well'
Liverpool manager Juergen Klopp has dismissed claims that it is the perfect time to face Tottenham Hotspur because of injuries to key players and concern over striker Harry Kane's form and freshness.
Liverpool suffered a shock 2-1 loss to Championship side Wolverhampton Wanderers in the FA Cup fourth round on Saturday, handing manager Juergen Klopp a third home defeat in a row.
IMAGES from the Champions League 2nd semi-final first leg match between Barcelona and Liverpool at Nou Camp on Wednesday
Imperious Liverpool extended their Premier League home winning streak against Arsenal to six on Saturday with an easy 4-0 victory that lifted them to second in the table.
Manager Juergen Klopp has extended his contract with Liverpool, less than a year since joining the club, the English Premier League side announced on Friday.
Liverpool were left frustrated by Championship side Blackburn Rovers who defended heroically to draw 0-0 at Anfield.
