In weather conditions perhaps more akin to Texas than Merseyside, the Reds were a joy to watch and took less than two minutes to open the scoring. A break from an Everton free-kick, inspired by Paul Pogba's unerring pass, allowed Jesse Lingard to volley the ball into the path of Will Keane, who fired through Adam Davies' legs.
Five minutes later, Lingard was again the creator for Petrucci to sweep home an emphatic finish from the edge of the box and it was largely one-way traffic with Tom Cleverley and Matty James dominating midfield. Will Keane volleyed just wide from a Pogba cross and another Petrucci effort dipped over the top.
Will Keane headed off the line to deny David Weir but was back to his day job when picking up a stray pass by Davies although the keeper recovered to stop him in his tracks with Lingard screaming for the opportunity to tap in if a pass had been made. Lingard did get his deserved goal when finishing off a splendid one-touch move after Will Keane had initially held off Weir, the winger firing home with aplomb in the second half.
Ryan Tunnicliffe came off the bench to spark a fourth soon afterwards, playing in Fabio and driving into the box but it was Petrucci who was first to the Brazilian's lay-off, burying another clinical finish. Cleverley survived a couple of rash challenges, which saw Eric Dier and Francisco Junior booked, to continue to pull the strings.
Although Ben Amos tipped over from Ross Barkley, there was a late consolation courtesy of substitute Christopher Long, who kept his head to neatly tuck home but, by then, United had reorganised things to such an extent that Ritchie De Laet