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Paulo Dybala, who was tipped to leave Roma this summer until signing a contract extension this summer, set up all of Malen's goals in the thumping win. 

Roma started brightly and forced David de Gea into an early stop, with Dybala cutting inside from the right and testing the Fiorentina goalkeeper from the edge of the box.

De Gea was called into action again soon after, this time tipping Rodrigo Mora's curling effort over the crossbar, but the Spaniard could do nothing to stop Roma taking the lead. 

After driving into the Fiorentina box from the right, Dybala laid the ball off to Malen, who did brilliantly to turn beyond Dodo before squeezing the ball into the bottom-left corner.

Roma needed just seven minutes of the second half to double their advantage through Malen. The Netherlands international collected Dybala's pass before breezing past Radu Dragusin and firing his shot into the roof of the net, despite De Gea's best efforts. 

The same duo combined once again to put the result beyond doubt on the hour. After Emanuele Lulli won back possession high up the pitch, Dybala raced to the byline before crossing for Malen to tap into the net and complete his hat-trick. 

Niccolo Pisilli added further gloss for Gian Piero Gasperini's team, prodding past De Gea after the ball broke kindly to him in the area off Rolando Mandragora's outstretched boot. 

In the other Serie A match taking place, Roma's rival Lazio got up and running with a 1-0 win at Bologna, with Davide Frattesi's 59th-minute strike the difference.