After years of training on Hallamshire GC, Fitzpatrick took the title in Brookline, Massachusetts, on Sunday (June 19), earning Sheffield its second Major champion in six years.
The 27-year-old was in tears as he and his family reveled in what is his first US Open win, where he told reporters: "It's what you grow up dreaming of.
"It's something I've worked so hard for for such a long time. I've got to give myself credit: I had so much patience."
Today, Prime Minister Boris Johnson tweeted his congratulations for the 27-year-old golfer.
The message on Mr Johnson’s account reads: “Huge congratulations to @MattFitz94 on winning the @usopengolf.
"You have made the city of Sheffield and indeed the while country incredibly proud.”
Commentators have praised Fitzpatrick’s performance last night that pitted him against Scottie Sheffler and Will Zalatoris.
He is South Yorkshire’s second Major winner after Danny Willett in 2016.