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to delay his shot and allow Maguire to intervene.
Mohamed Diame headed wide when he might have done better from Christian Atsu’s cross four minutes later, but Maguire did hit the target at the other end from Maddison’s 28th-minute corner, prompting Dubravka to make another save.
However, the Slovakia international was beaten two minutes later when, after referee Simon Hooper had ruled that Yedlin had blocked Maguire’s effort with his arms, Vardy was clinical from 12 yards.
Jonjo Shelvey tested the back-pedalling Kasper Schmeichel from halfway with an audacious effort eight minutes before the break.
But Newcastle boss Rafael Benitez turned away in disgust four minutes after the restart when Hooper waved play on after Perez appeared to have been wrestled to the ground by Maguire inside the box.
The perceived injustice seemed to inspire the home side as the crowd responded, although Maguire dragged a 59th-minute shot across goal at the other end after miskicking his initial volley.
But their hopes of mounting a fightback were dashed when Maguire powered home Maddison’s 73rd-minute corner to cement the victory. NEWCASTLE UNITED:
Dubravka 6; Yedlin 6 (Manquillo 80, 5), Lascelles 5, Clark 6, Ritchie 6 (Murphy 65, 6); Atsu 6, Diame 5, Shelvey 7, Kenedy 7; Perez 6 (Muto 69, 6); Joselu 6. Unused subs – Darlow (Gk), Schar, Hayden, Longstaff. leicester City: Schmeichel 7; Amartey 6, Morgan 6, Maguire 8, Chilwell 7; Mendy 7, Ndidi 6; Pereira 7, Iheanacho 6, Maddison 6 (Iborra 85, 5); Vardy 7 (Albrighton 74, 6). Unused subs – Ward (Gk), Evans, Okazaki, Fuchs, Ghezzal.