The 28-year-old from Sheffield only confirmed his participation last week after his wife Nicole gave birth to the couple’s first child.
Here is a look at the response on Twitter:
“This isn’t a shock win, @Danny_Willett has been playing great for two years now. Gave Rory a run for his money in R2D last year” - former world No 1 Luke Donald.
“[email protected]_Willett well done that man.... And I new baby that was due today... The name Augusta sounds pretty good.” - Ryder Cup star Ian Poulter, who finished in a tie for 49th.
“Congrats @Danny_Willett incredible stuff enjoy all that’s coming your way you deserve it all” - 1999 Open winner Paul Lawrie.
“Wow @Danny_Willett congrats to you and @Smartie13 #winning.” - Irish golfer Shane Lowry.
“Bangers and mash this time next year....” - 2008 Masters champion Trevor Immelman predicts what Willett will choose at the Champions’ Dinner in 12 months.
“Bloody tears in this household @Danny_Willett .. You little beauty .. #Masters” - Former England cricket captain Michael Vaughan.
“Enjoy tonight @Danny_Willett get down the Local in your Green Jacket when your (sic) home for a pint of mild. #Masters2016 #Yorkshire” - Yorkshire and England bowler Tim Bresnan.
“Not often we’ve been able to say it but an Englishman is Masters Champion. Congratulations Danny Willett.” - Former England striker Michael Owen.
“What a round by Danny Willett! Always good to see an English winner! Masters Champion! #Masters #Willett” - Tottenham and England striker Harry Kane.
“And now Jordan has to give him the jacket? Brutal. #MastersSunday” - British tennis player Laura Robson.
“Speechless. I once punched that kid in the head for hurting my pet rat. Now look.” - Willett’s brother, PJ.
“I’m guessing Sheffield walked away with the better ball plate at #Augusta thanks to @Danny_Willett @MattFitz94 - Chris Stratford, The Yorkshire Post golf writer, after Fitzpatrick also closed with a 67.