Krzysztof Piatek continued his incredible scoring form with a decisive brace as AC Milan secured a potentially pivotal 3-1 win at Atalanta on Saturday.

On target in each of his previous three appearances, Poland international Piatek struck either side of half-time to help secure a come-from-behind victory that moved Milan four points clear of the hosts, who slipped down to seventh.

His first cancelled out Remo Freuler's 33rd-minute opener before Hakan Calhanoglu completed the quickfire turnaround with a thunderous drive 10 minutes after the interval.

That set the stage for Piatek to extend his prolific start with the Rossoneri to by making it six goals in his past four matches and, although the 23-year-old was later withdrawn following a knock to his foot, Gennaro Gattuso's side were able to sew up a crucial result in the fight for Champions League qualification.

Franck Kessie, facing his parent club, fluffed two good chances to open the scoring in the early stages, blasting a shot wastefully high and nodding a Suso cross wide of the near post.

Atalanta were otherwise on top during the first half and deservedly led when Freuler forced a first-time effort through Gianluigi Donnarumma following Josip Ilicic's fine build-up play.

Piatek, though, ensured parity was restored on the stroke of half-time with a sublime flicked finish across Etrit Berisha from Ricardo Rodriguez's cross.

Atalanta looked to be reasserting control until, out of nothing, playmaker Calhanoglu rifled an unstoppable bullet into the bottom-right corner.

The visitors were buoyed and Piatek put the seal on their impressive fightback by bravely rising between goalkeeper Berisha and Duvan Zapata to head in Calhanoglu's corner, stretching Milan's unbeaten streak to seven Serie A matches.