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In a pulsating encounter of near-misses and tense moments, De Gea and Milan goalkeeper Mike Maignan pulled off breathtaking penalty saves. De Gea kept out spot kicks from Theo Hernandez and Tammy Abraham, while Maignan denied Moise Kean.
"Today's win is crucial. Finally, the work we've put in over the past few weeks is starting to pay off," De Gea told DAZN.
"It was an incredible night. I want to focus not on penalties, but on the work the team is doing to give the fans a night like this."
It was the first time two penalties had been saved by one goalkeeper in a Serie A match since May 2016.
Emotions ran high in the final moments as Fiorentina coach Raffaele Palladino was sent off for protesting, while Kean was again denied when his superb shot hit the underside of the bar and bounced out in the dying minutes.
