Ciro Immobile thought he had a hat-trick, but the opening goal was later awarded as a Fabio Depaoli own goal due to the final deflection.
Immobile did get his goal eventually on a Sergej Milinkovic-Savic assist, Joaquin Correa won and converted a penalty, then Marco Sau’s splendid curler pulled one back.
Lorenzo Montipò was unlucky to deflect a cross into his own net, but made up for it by saving Immobile’s penalty.
Benevento refused to give in, getting a spot-kick of their own, a Gianluca Lapadula header disallowed for a push and Kamil Glik nodding in for 4-3.
However, just as Lazio were under siege, they added a fifth on the counter with Immobile.