Peter Crouch scored twice to help Liverpool book their place in the final of the Club World Championship.
The Reds dominated their semi-final against Costa Rican side Deportivo Saprissa, taking an early lead when Crouch steered in a first-time shot.
Steve Gerrard made it 2-0 with a volley from the edge of the box to finish off a flowing move before Crouch slotted home a third after half-time.
Liverpool will play Brazilian outfit Sao Paulo in Sunday's final.
Over 1,000 Liverpool fans had made the long trip to the Yokohama International Stadium to see their side begin their bid to win the trophy for the first time.
They saw the Reds make a perfect start, going ahead inside three minutes.
Djibril Cisse teed up Crouch from John Arne Riise's cross, and the big striker expertly directed his volley into the bottom corner of the net.
Deportivo's response was hardly inspirational.
They struggled to even hold on to possession, making life easy for a Liverpool side that continued to threaten.
Crouch went close from a Steven Gerrard cross, the lively Cisse - handed a rare start by Benitez - volleyed over, and Riise tested goalkeeper Jose Porras with a header.
Deportivo did manage a shot on goal just before the half-hour mark when Jose Francisco Saborio latched on to Walter Centeno's through-ball but his powerful effort flew wide.
And Liverpool were 2-0 up soon after. Another Riise cross found Gerrard unmarked on the edge of the area and he thundered his volley past Porras with the outside of his foot.
The game looked sewn up after just 32 minutes, and so it proved.
Deportivo did not improve after half-time, and their toothless attack meant a club-record 11th successive clean sheet for Liverpool was rarely in doubt.
The majority of the action continued to take place at the Deportivo end, with Cisse nodding a Gerrard free-kick just wide then failing to find Riise when the Norwegian had the goal at his mercy.
A third Liverpool goal arrived on 58 minutes, with Crouch getting a deserved second.
The ball broke to him on the edge of the box and he had time to compose himself before slotting the ball home.
The England international could even have notched a third before the end but fired high and wide after making space for himself in the area.
Reds goalkeeper Jose Reina was eventually called into action to keep out a curling free-kick before Centeno's shot was deflected over.
And he made sure of another clean sheet when he blocked a Cristian Bolanos effort in injury time.