United were upset by an injury to Barlow, who landed awkwardly after leaping for the ball, but the pattern of the game remained the same. Chong was withdrawn, with Josh Bohui taking his place, and Newcastle finally enjoyed a short spell of possession, with Lewis Cass’s shot well off target their only noteworthy attempt.
Greenwood started to cause some havoc, having a deflected effort saved before showing neat footwork to almost tee up Burkart for a hat-trick, only for the Magpies to smuggle it clear. Greenwood had a low drive kept out by Harker but was not to be kept off the scoresheet. The teenager, who came on as a substitute for the first team in the win over West Ham United on Saturday, hammered a brilliant free-kick past Harker to add a fourth goal.
Substitute Dylan Levitt latched onto a pass by George Tanner to cross into the danger zone and Walters appeared to get the final touch as Greenwood closed in on his second, with it going down as an own goal. Newcastle showed their frustration in the closing stages as United continued looking the part right up until the final whistle.