Liverpool went ahead against Crystal Palace in the 23rd minute of the first half. And he did so with a lovely free-kick by Alexander-Arnold which left the visiting goalie with no chance.
The home side cannot win the league on Wednesday even if they win, but they will move a step closer with victory.
The hosts took the lead thanks to a fantastic free-kick by the full-back. From the edge of the area, Alexander-Arnold hit it into Hennessey's top left hand corner. The keeper's dive was in vain and Liverpool were 1-0 up.
In addition, at the age of 21 years and 261 days, he became the youngest Liverpool player to score a free-kick at Anfield. Robbie Fowler's goal in 1995 was the previous best.