Another Mohamed Salah masterclass helped Liverpool take control of their Champions League semi-last - yet two late Roma away objectives gave the Italian side a promise of something better for the second leg.
Liverpool, who last achieved the last in 2007, over and again broke the guests' gullibly high protective line and scored five times in the opening 68 minutes at a rambunctious Anfield.
Salah, who has now scored 43 objectives since his mid year move from Roma, scored twice and helped two different objectives.
He twisted his first into the best corner from the edge of the case - then cut the ball over Alisson for a moment.
Salah at that point kept running down the privilege and squared for Sadio Mane to make it 3-0 - before doing likewise to set up Roberto Firmino.
Liverpool at that point turned out to be just the second group to score five objectives in a Champions League semi-last match when Firmino headed in James Milner's corner.
With his side driving 5-0, Reds manager Jurgen Klopp took off Salah - and Roma gave themselves a possibility for one week from now's arrival leg at the Stadio Olimpico.
In the first place Edin Dzeko lashed home from Radja Nainggolan's pass, at that point Diego Perotti put a punishment into the upper right corner after Milner dealt with Nainggolan's shot.
Also, Roma require just look to the last round for motivation - they lost the primary leg in Barcelona 4-1 preceding winning 3-0 in Italy to advance on away objectives.
A rehash of the last scoreline this time would bring them into the last against Bayern Munich or Real Madrid.
Before Roma's late objectives, the one sharp note for Liverpool was seeing Alex Oxlade-Chamberlain leaving the field on a stretcher. Klopp said later the England midfielder "presumably had extremely terrible damage".