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Inter Milan extended their winless run to four games in all competitions when they were held to a 1-1 draw at Atalanta in Serie A on Sunday.
Diogo Jota scored a hat-trick as Liverpool breezed past hosts Atalanta 5-0 in Champions League group-stage action on Tuesday.
Luis Muriel scored twice in the first half to give Atalanta a 2-1 victory at Crotone on Saturday and put them back on a winning path in Serie A.
Striker Duvan Zapata scored twice in six minutes to drag Atalanta back from a two-goal deficit and ensure a 2-2 draw with Ajax Amsterdam.
Sampdoria's veteran forward Fabio Quagliarella scored an early goal and missed a penalty as his side produced a shock 3-1 win away to Atalanta.
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Towering Colombian striker Duvan Zapata scored one goal and set up two more as Atalanta cruised to a 4-0 victory over Midtjylland.
Napoli blasted four goals in a devastating 20-minute first half spell as they thumped Atalanta 4-1 in Serie A on Saturday.
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Manchester United have agreed a deal with Atalanta to sign winger Amad Diallo Traore in January, the Old Trafford club announced on Monday.
Irrepressible Atalanta kept up their record of scoring at least four goals in every game this season as they despatched Cagliari 5-2 on Sunday.