La Dea had scored four in each of their opening two matches – dispatching Torino and Lazio respectively – and took things a step further as they returned to play in Bergamo to take their tally of goals to 13 from just three matches.
Luis Muriel opened the scoring with just seven minutes played as he beat the Sardinians’ offside trap to go one-on-one with Alessio Cragno.
Diego Godin marked his Rossoblu debut with a goal, heading in a corner to level up the scores.
Papu Gomez’s fine form continued as he curled in their second with a little under half an hour played, almost replicating his strike against Torino in their first game of the season.
The move began as far back as Atalanta’s own box though, where the captain himself set them off with a fine blind pass that sprung a counterattack.
Mario Pasalic capped off another excellent team move minutes later, benefitting from Robin Gosens’ selflessness to tap in from close range.
Duvan Zapata wasn’t best pleased that his teammates had scored 11 goals this term without him having found the net, so he took things into his own hands to give Atalanta a fourth, cutting in from the left to find the bottom corner.
Joao Pedro had Cragno to thank as he reduced the deficit with a nice finish of his own, having seen his goalkeeper pull off three good saves at the other end moments earlier.
But Sam Lammers came off the bench to grab his first goal for Atalanta in typical Atalanta fashion, showing good footwork to dazzle Cagliari’s defence before finishing past Cragno.