Duvan Zapata struck late as Atalanta warmed up for their Champions League debut with a last-gasp 2-1 victory over Genoa in Serie A as Roma got their first win this season against Sassuolo, but city rival's Lazio fell at SPAL.
Colombian international Zapata rifled in the winner on 95 minutes in Genoa on Sunday to seal all three points for Atalanta who qualified for the Champions League by finishing third last season, but lost last week to Torino.
Colombian striker Muriel's 64th-minute penalty had put the Bergamo side ahead in western Italy but Genoa captain Domenico Criscito levelled from the spot after 91 minutes.
Zapata had the final say to give Gian Piero Gasperini's side, who are sixth, a confidence boost as they travel to Dinamo Zagreb for their first ever Champions League game next week.
AC Milan are just behind Atalanta, also with six points, after Polish striker Krzysztof Piatek got back scoring with a 68th-minute penalty in a hard-fought 1-0 victory over 10-man Verona.
Roma are just behind in eighth after new coach Paulo Fonseca got his first win , a 4-2 defeat of Sassuolo, for the capital side.
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The hosts were four goals up at the break after Bryan Cristante, Edin Dzeko, Henrikh Mikhitaryan and Justin Kluivert all found the net in a 21-minute spell with Lorenzo Pellegrini providing three assists.
But Domenico Berardi's brace for Sassuolo on 53 and 72 minutes rattled the hosts who are back in the Stadio Olimpico during the week for Europa League action against Istanbul Basaksehir.
"I hope that this will be the first of a lot of victories," said Portuguese Fonseca.
"I realised that I had to adapt to the dynamics of the Italian championship.
"Today we showed our ability to press high, and while we scored four goals it could have been seven or eight.
"Defensively it was our best performance so far."
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"We talked to him before the game, for us it is very important and we miss him. We play like this thanks to his mentality."