The Reds' vice-captain showcased his dead-ball abilities by thundering in a free-kick from 25 yards out, with the ball cannoning off goalkeeper Bernd Leno and into the net.
Then, as Liverpool desperately pushed for a winner late on, it was Alexander-Arnold who produced the moment of magic, volleying in brilliantly from the edge of the box in the 88th minute.
Alan Shearer, the Premier League's all-time top scorer and Hall of Fame inductee, has hailed Alexander-Arnold's impact and selected the Reds star in his Team of the Week, alongside four Newcastle United players.
Trent Alexander-Arnold (Liverpool)
"Took matters into his own hands with an incredible display. Playing him in midfield takes Liverpool onto another level."
Enzo Fernandez (Chelsea)
"Delivered a proper No 8 performance and showed great character to step up and convert the penalty that ultimately won the match."
Bukayo Saka (Arsenal)
"Imperious once again. Brilliant skill to create the opening for his goal, and wonderful composure to finish it."
Zeki Amdouni (Burnley)
"Led the line brilliantly and took his goal very well."
Anthony Gordon (Newcastle)
"Although Newcastle don't have many options going forward, Gordon is making sure the goals keep coming."
Manager: Ange Postecoglou (Spurs)
"His side struggled in the first half but Postecoglou's brilliant changes turned the match round for Spurs."