Cody Gakpo's strike with 12 minutes left looked like it would end Liverpool's losing streak, only for Maguire to head beyond Liverpool keeper Giorgi Mamardashvili six minutes from time.
Gakpo scored from close range after earlier hitting the woodwork three times, but Ruben Amorim's side continued to press forward, with Maguire providing a dramatic finale.
United stunned Liverpool by taking the lead inside two minutes, although it was a moment shrouded in controversy, referee Michael Oliver letting the play go on even though Alexis Mac Allister was lying prone with a head injury after being accidentally elbowed by team-mate Virgil van Dijk.
Bryan Mbeumo was not waiting around, applying the finish past Mamardashvili, deputising for the injured Alisson.
In an end-to-end encounter, United captain Bruno Fernandes wasted an opportunity to double their lead, shooting wide with the goal at his mercy, while Liverpool's fortunes were summed up by Gakpo hitting the woodwork twice before the break and once more in the second half in front of The Kop. The Dutchman also headed wide late on, when he looked certain to equalise for a second time.
United's new Belgian keeper Senne Lammens also distinguished himself by saving from Alexander Isak when he raced clear....<<<Read More>>>...
