Inter Milan's attack might be better off without Romelu Lukaku with the Nerazzurri spreading the scoring around more and playing as a more cohesive unit since the Belgium ace left for European champions Chelsea.
Three days after a 6-1 rout of Bologna, Inter recovered from going a goal down for a 3-1 away win over a Fiorentina side that had won three straight.
Matteo Darmian, Edin Dzeko and Ivan Perisic scored for Inter after Riccardo Sottil's opener for La Viola as the Serie A champions extended their unbeaten start with a fourth win in five matches.
The victory moved Inter one point above Napoli, who play at Sampdoria on Thursday.
With 18 goals in five matches, Inter have the most productive attack in the league and also the highest number of different scorers (11) - virtually erasing worries about replacing the 24 league goals that Lukaku scored last season.
"We've had a great start to the season but I think we can still improve," Inter coach Simone Inzaghi, who was hired when Antonio Conte stepped down days after leading the Nerazzurri to their first Serie A title in 11 years, said.
"We lost three key players this summer in Lukaku, (Achraf) Hakimi and (Christian) Eriksen but we're coming together."
Inter's third goal came after Fiorentina forward Nicolas Gonzalez was sent off after being shown two yellow cards in succession for protests.
Considering their high-powered attack of the last few seasons, Atalanta are still working their way in to form.
The Bergamo squad beat visitors Sassuolo 2-1 with first-half goals from Robin Gosens and Davide Zappacosta.
Domenico Berardi pulled one back for Sassuolo after the break.
Atalanta moved up to fourth, three points behind Inter.
Aaron Hickey became the first Scottish player to score in Serie A since Graeme Souness in 1986 with the opening goal for Bologna in a 2-2 draw against Genoa.
The other Scots to score in the Italian league were Joe Jordan and Denis Law.
Genoa twice came back from a goal down, with Domenico Criscito's 89th-minute penalty serving as the final equaliser.
Hickey, a 19-year-old left back, scored with a long, low shot through traffic after a rebound.
Australian Associated Press
